Analysis of interatomic Contacts of Structural Units in PDB entry:
1R3N

Contacts of Structural Units (CSU) are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332).
This page provides analyses of contacts formed by:

chains
helices
sheets
residues

For analysis of ligand-protein contacts, use:

LPC software

3D structure can be seen in additional window with STING software for 1R3N entry

There are 8 chains in PDB entry 1R3N (CSU analysis of residue contacts immediately below table)

Chain ID	Initial residue	Terminal residue
A	GLY 18	HIS 455
B	PRO 23	HIS 455
C	GLY 18	HIS 455
D	THR 19	HIS 455
E	PRO 23	HIS 455
F	GLY 18	HIS 455
G	ALA 26	HIS 455
H	GLY 18	HIS 455

There are120 helices in PDB entry 1R3N. Click on helix of interest for CSU analysis.

Helix number	Helix ID	Chain ID	Initial residue	Terminal residue	Helix class
Helix 1	1	A	33	46	Right-handed alpha
Helix 2	2	A	67	84	Right-handed alpha
Helix 3	3	A	126	143	Right-handed alpha
Helix 4	4	A	168	175	Right-handed alpha
Helix 5	5	A	179	185	Right-handed alpha
Helix 6	6	A	196	204	Right-handed alpha
Helix 7	7	A	231	236	Right-handed alpha
Helix 8	8	A	267	271	Right-handed 310
Helix 9	9	A	273	292	Right-handed alpha
Helix 10	10	A	325	344	Right-handed alpha
Helix 11	11	A	368	381	Right-handed alpha
Helix 12	12	A	384	386	Right-handed 310
Helix 13	13	A	398	403	Right-handed alpha
Helix 14	14	A	415	419	Right-handed 310
Helix 15	15	A	428	455	Right-handed alpha
Helix 16	16	B	33	46	Right-handed alpha
Helix 17	17	B	67	83	Right-handed alpha
Helix 18	18	B	126	143	Right-handed alpha
Helix 19	19	B	168	175	Right-handed alpha
Helix 20	20	B	179	185	Right-handed alpha
Helix 21	21	B	196	204	Right-handed alpha
Helix 22	22	B	231	236	Right-handed alpha
Helix 23	23	B	267	271	Right-handed 310
Helix 24	24	B	273	292	Right-handed alpha
Helix 25	25	B	325	344	Right-handed alpha
Helix 26	26	B	368	381	Right-handed alpha
Helix 27	27	B	384	386	Right-handed 310
Helix 28	28	B	398	403	Right-handed alpha
Helix 29	29	B	415	419	Right-handed 310
Helix 30	30	B	428	455	Right-handed alpha
Helix 31	31	C	33	46	Right-handed alpha
Helix 32	32	C	67	83	Right-handed alpha
Helix 33	33	C	126	143	Right-handed alpha
Helix 34	34	C	168	175	Right-handed alpha
Helix 35	35	C	179	185	Right-handed alpha
Helix 36	36	C	196	204	Right-handed alpha
Helix 37	37	C	231	236	Right-handed alpha
Helix 38	38	C	267	271	Right-handed 310
Helix 39	39	C	273	292	Right-handed alpha
Helix 40	40	C	325	344	Right-handed alpha
Helix 41	41	C	368	381	Right-handed alpha
Helix 42	42	C	384	386	Right-handed 310
Helix 43	43	C	398	403	Right-handed alpha
Helix 44	44	C	415	419	Right-handed 310
Helix 45	45	C	428	454	Right-handed alpha
Helix 46	46	D	33	46	Right-handed alpha
Helix 47	47	D	67	84	Right-handed alpha
Helix 48	48	D	126	143	Right-handed alpha
Helix 49	49	D	168	175	Right-handed alpha
Helix 50	50	D	179	185	Right-handed alpha
Helix 51	51	D	196	204	Right-handed alpha
Helix 52	52	D	231	236	Right-handed alpha
Helix 53	53	D	267	271	Right-handed 310
Helix 54	54	D	273	292	Right-handed alpha
Helix 55	55	D	325	344	Right-handed alpha
Helix 56	56	D	368	381	Right-handed alpha
Helix 57	57	D	384	386	Right-handed 310
Helix 58	58	D	398	403	Right-handed alpha
Helix 59	59	D	415	419	Right-handed 310
Helix 60	60	D	428	455	Right-handed alpha
Helix 61	61	E	33	46	Right-handed alpha
Helix 62	62	E	67	83	Right-handed alpha
Helix 63	63	E	126	143	Right-handed alpha
Helix 64	64	E	168	175	Right-handed alpha
Helix 65	65	E	179	185	Right-handed alpha
Helix 66	66	E	196	204	Right-handed alpha
Helix 67	67	E	231	236	Right-handed alpha
Helix 68	68	E	267	271	Right-handed 310
Helix 69	69	E	273	292	Right-handed alpha
Helix 70	70	E	325	344	Right-handed alpha
Helix 71	71	E	368	381	Right-handed alpha
Helix 72	72	E	384	386	Right-handed 310
Helix 73	73	E	398	403	Right-handed alpha
Helix 74	74	E	415	419	Right-handed 310
Helix 75	75	E	428	453	Right-handed alpha
Helix 76	76	F	33	46	Right-handed alpha
Helix 77	77	F	67	84	Right-handed alpha
Helix 78	78	F	126	143	Right-handed alpha
Helix 79	79	F	168	175	Right-handed alpha
Helix 80	80	F	179	185	Right-handed alpha
Helix 81	81	F	196	204	Right-handed alpha
Helix 82	82	F	231	236	Right-handed alpha
Helix 83	83	F	267	271	Right-handed 310
Helix 84	84	F	273	292	Right-handed alpha
Helix 85	85	F	325	344	Right-handed alpha
Helix 86	86	F	368	381	Right-handed alpha
Helix 87	87	F	384	386	Right-handed 310
Helix 88	88	F	398	403	Right-handed alpha
Helix 89	89	F	415	419	Right-handed 310
Helix 90	90	F	428	455	Right-handed alpha
Helix 91	91	G	33	46	Right-handed alpha
Helix 92	92	G	67	83	Right-handed alpha
Helix 93	93	G	126	143	Right-handed alpha
Helix 94	94	G	168	175	Right-handed alpha
Helix 95	95	G	179	185	Right-handed alpha
Helix 96	96	G	196	204	Right-handed alpha
Helix 97	97	G	231	236	Right-handed alpha
Helix 98	98	G	267	271	Right-handed 310
Helix 99	99	G	273	292	Right-handed alpha
Helix 100	100	G	325	344	Right-handed alpha
Helix 101	101	G	368	381	Right-handed alpha
Helix 102	102	G	384	386	Right-handed 310
Helix 103	103	G	398	403	Right-handed alpha
Helix 104	104	G	415	419	Right-handed 310
Helix 105	105	G	428	453	Right-handed alpha
Helix 106	106	H	33	46	Right-handed alpha
Helix 107	107	H	67	83	Right-handed alpha
Helix 108	108	H	126	143	Right-handed alpha
Helix 109	109	H	168	175	Right-handed alpha
Helix 110	110	H	179	185	Right-handed alpha
Helix 111	111	H	196	204	Right-handed alpha
Helix 112	112	H	231	236	Right-handed alpha
Helix 113	113	H	267	271	Right-handed 310
Helix 114	114	H	273	292	Right-handed alpha
Helix 115	115	H	325	344	Right-handed alpha
Helix 116	116	H	368	381	Right-handed alpha
Helix 117	117	H	384	386	Right-handed 310
Helix 118	118	H	398	403	Right-handed alpha
Helix 119	119	H	415	419	Right-handed 310
Helix 120	120	H	428	455	Right-handed alpha

There are 48 sheets in PDB entry 1R3N. Click on sheet of interest to get list of strands forming it: A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, AA, AB, AC, AD, AE, AF, AG, AH, AI, AJ, AK, AL, AM, AN, AO, AP, AQ, AR, AS, AT, AU, AV,

There are 2 strands in A sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	A	48	49	first strand
Strand 2	A	60	61	anti-parallel

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There are 8 strands in B sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	A	87	90	first strand
Strand 2	A	96	100	anti-parallel
Strand 3	A	151	155	anti-parallel
Strand 4	A	109	113	parallel
Strand 5	A	222	227	parallel
Strand 6	A	408	413	parallel
Strand 7	A	240	246	anti-parallel
Strand 8	A	365	366	anti-parallel

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There are 8 strands in C sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	A	87	90	first strand
Strand 2	A	96	100	anti-parallel
Strand 3	A	151	155	anti-parallel
Strand 4	A	109	113	parallel
Strand 5	A	222	227	parallel
Strand 6	A	408	413	parallel
Strand 7	A	240	246	anti-parallel
Strand 8	A	388	393	parallel

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There are 3 strands in D sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	A	295	297	first strand
Strand 2	A	314	323	anti-parallel
Strand 3	A	301	304	anti-parallel

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There are 4 strands in E sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	A	295	297	first strand
Strand 2	A	314	323	anti-parallel
Strand 3	A	248	257	anti-parallel
Strand 4	A	353	362	anti-parallel

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There are 2 strands in F sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	A	261	262	first strand
Strand 2	A	310	311	anti-parallel

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There are 2 strands in G sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	B	48	49	first strand
Strand 2	B	60	61	anti-parallel

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There are 8 strands in H sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	B	87	90	first strand
Strand 2	B	96	100	anti-parallel
Strand 3	B	151	155	anti-parallel
Strand 4	B	109	113	parallel
Strand 5	B	222	227	parallel
Strand 6	B	408	413	parallel
Strand 7	B	240	246	anti-parallel
Strand 8	B	365	366	anti-parallel

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There are 8 strands in I sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	B	87	90	first strand
Strand 2	B	96	100	anti-parallel
Strand 3	B	151	155	anti-parallel
Strand 4	B	109	113	parallel
Strand 5	B	222	227	parallel
Strand 6	B	408	413	parallel
Strand 7	B	240	246	anti-parallel
Strand 8	B	388	393	parallel

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There are 3 strands in J sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	B	295	297	first strand
Strand 2	B	314	323	anti-parallel
Strand 3	B	301	304	anti-parallel

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There are 4 strands in K sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	B	295	297	first strand
Strand 2	B	314	323	anti-parallel
Strand 3	B	248	257	anti-parallel
Strand 4	B	353	362	anti-parallel

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There are 2 strands in L sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	B	261	262	first strand
Strand 2	B	310	311	anti-parallel

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There are 2 strands in M sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	C	48	49	first strand
Strand 2	C	60	61	anti-parallel

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There are 8 strands in N sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	C	87	90	first strand
Strand 2	C	96	100	anti-parallel
Strand 3	C	151	155	anti-parallel
Strand 4	C	109	113	parallel
Strand 5	C	222	227	parallel
Strand 6	C	408	413	parallel
Strand 7	C	240	246	anti-parallel
Strand 8	C	365	366	anti-parallel

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There are 8 strands in O sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	C	87	90	first strand
Strand 2	C	96	100	anti-parallel
Strand 3	C	151	155	anti-parallel
Strand 4	C	109	113	parallel
Strand 5	C	222	227	parallel
Strand 6	C	408	413	parallel
Strand 7	C	240	246	anti-parallel
Strand 8	C	388	393	parallel

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There are 3 strands in P sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	C	295	297	first strand
Strand 2	C	314	323	anti-parallel
Strand 3	C	301	304	anti-parallel

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There are 4 strands in Q sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	C	295	297	first strand
Strand 2	C	314	323	anti-parallel
Strand 3	C	248	257	anti-parallel
Strand 4	C	353	362	anti-parallel

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There are 2 strands in R sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	C	261	262	first strand
Strand 2	C	310	311	anti-parallel

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There are 2 strands in S sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	D	48	49	first strand
Strand 2	D	60	61	anti-parallel

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There are 8 strands in T sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	D	87	90	first strand
Strand 2	D	96	100	anti-parallel
Strand 3	D	151	155	anti-parallel
Strand 4	D	109	113	parallel
Strand 5	D	222	227	parallel
Strand 6	D	408	413	parallel
Strand 7	D	240	246	anti-parallel
Strand 8	D	365	366	anti-parallel

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There are 8 strands in U sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	D	87	90	first strand
Strand 2	D	96	100	anti-parallel
Strand 3	D	151	155	anti-parallel
Strand 4	D	109	113	parallel
Strand 5	D	222	227	parallel
Strand 6	D	408	413	parallel
Strand 7	D	240	246	anti-parallel
Strand 8	D	388	393	parallel

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There are 3 strands in V sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	D	295	297	first strand
Strand 2	D	314	323	anti-parallel
Strand 3	D	301	304	anti-parallel

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There are 4 strands in W sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	D	295	297	first strand
Strand 2	D	314	323	anti-parallel
Strand 3	D	248	257	anti-parallel
Strand 4	D	353	362	anti-parallel

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There are 2 strands in X sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	D	261	262	first strand
Strand 2	D	310	311	anti-parallel

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There are 2 strands in Y sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	E	48	49	first strand
Strand 2	E	60	61	anti-parallel

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There are 8 strands in Z sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	E	87	90	first strand
Strand 2	E	96	100	anti-parallel
Strand 3	E	151	156	anti-parallel
Strand 4	E	109	114	parallel
Strand 5	E	222	227	parallel
Strand 6	E	408	413	parallel
Strand 7	E	240	246	anti-parallel
Strand 8	E	365	366	anti-parallel

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There are 8 strands in AA sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	E	87	90	first strand
Strand 2	E	96	100	anti-parallel
Strand 3	E	151	156	anti-parallel
Strand 4	E	109	114	parallel
Strand 5	E	222	227	parallel
Strand 6	E	408	413	parallel
Strand 7	E	240	246	anti-parallel
Strand 8	E	388	393	parallel

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There are 3 strands in AB sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	E	295	297	first strand
Strand 2	E	314	323	anti-parallel
Strand 3	E	301	304	anti-parallel

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There are 4 strands in AC sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	E	295	297	first strand
Strand 2	E	314	323	anti-parallel
Strand 3	E	248	257	anti-parallel
Strand 4	E	353	362	anti-parallel

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There are 2 strands in AD sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	E	261	262	first strand
Strand 2	E	310	311	anti-parallel

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There are 2 strands in AE sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	F	48	49	first strand
Strand 2	F	60	61	anti-parallel

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There are 8 strands in AF sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	F	87	90	first strand
Strand 2	F	96	100	anti-parallel
Strand 3	F	151	155	anti-parallel
Strand 4	F	109	113	parallel
Strand 5	F	222	227	parallel
Strand 6	F	408	413	parallel
Strand 7	F	240	246	anti-parallel
Strand 8	F	365	366	anti-parallel

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There are 8 strands in AG sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	F	87	90	first strand
Strand 2	F	96	100	anti-parallel
Strand 3	F	151	155	anti-parallel
Strand 4	F	109	113	parallel
Strand 5	F	222	227	parallel
Strand 6	F	408	413	parallel
Strand 7	F	240	246	anti-parallel
Strand 8	F	388	393	parallel

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There are 3 strands in AH sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	F	295	297	first strand
Strand 2	F	314	323	anti-parallel
Strand 3	F	301	304	anti-parallel

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There are 4 strands in AI sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	F	295	297	first strand
Strand 2	F	314	323	anti-parallel
Strand 3	F	248	257	anti-parallel
Strand 4	F	353	362	anti-parallel

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There are 2 strands in AJ sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	F	261	262	first strand
Strand 2	F	310	311	anti-parallel

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There are 2 strands in AK sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	G	48	49	first strand
Strand 2	G	60	61	anti-parallel

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There are 8 strands in AL sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	G	87	90	first strand
Strand 2	G	96	100	anti-parallel
Strand 3	G	151	156	anti-parallel
Strand 4	G	109	114	parallel
Strand 5	G	222	227	parallel
Strand 6	G	408	413	parallel
Strand 7	G	240	246	anti-parallel
Strand 8	G	365	366	anti-parallel

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There are 8 strands in AM sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	G	87	90	first strand
Strand 2	G	96	100	anti-parallel
Strand 3	G	151	156	anti-parallel
Strand 4	G	109	114	parallel
Strand 5	G	222	227	parallel
Strand 6	G	408	413	parallel
Strand 7	G	240	246	anti-parallel
Strand 8	G	388	393	parallel

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There are 3 strands in AN sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	G	295	297	first strand
Strand 2	G	314	323	anti-parallel
Strand 3	G	301	304	anti-parallel

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There are 4 strands in AO sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	G	295	297	first strand
Strand 2	G	314	323	anti-parallel
Strand 3	G	248	257	anti-parallel
Strand 4	G	353	362	anti-parallel

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There are 2 strands in AP sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	G	261	262	first strand
Strand 2	G	310	311	anti-parallel

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There are 2 strands in AQ sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	H	48	49	first strand
Strand 2	H	60	61	anti-parallel

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There are 8 strands in AR sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	H	87	90	first strand
Strand 2	H	96	100	anti-parallel
Strand 3	H	151	155	anti-parallel
Strand 4	H	109	113	parallel
Strand 5	H	222	227	parallel
Strand 6	H	408	413	parallel
Strand 7	H	240	246	anti-parallel
Strand 8	H	365	366	anti-parallel

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There are 8 strands in AS sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	H	87	90	first strand
Strand 2	H	96	100	anti-parallel
Strand 3	H	151	155	anti-parallel
Strand 4	H	109	113	parallel
Strand 5	H	222	227	parallel
Strand 6	H	408	413	parallel
Strand 7	H	240	246	anti-parallel
Strand 8	H	388	393	parallel

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There are 3 strands in AT sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	H	295	297	first strand
Strand 2	H	314	323	anti-parallel
Strand 3	H	301	304	anti-parallel

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There are 4 strands in AU sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	H	295	297	first strand
Strand 2	H	314	323	anti-parallel
Strand 3	H	248	257	anti-parallel
Strand 4	H	353	362	anti-parallel

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There are 2 strands in AV sheet. Click on strand of interest for CSU analysis.

Strand number	Chain ID	Initial residue	Terminal residue	Strand sense
Strand 1	H	261	262	first strand
Strand 2	H	310	311	anti-parallel

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Analysis of interatomic Contacts of Structural Units in PDB entry: 1R3N

Analysis of interatomic Contacts of Structural Units in PDB entry:
1R3N