1PGX:
reference: 1.67-A X-ray structure of the B2 immunoglobulin-binding domain of streptococcal protein G and comparison to the NMR structure of the B1 domain., Achari A, Hale SP, Howard AJ, Clore GM, Gronenborn AM, Hardman KD, Whitlow M, Biochemistry 1992 Nov 3;31(43):10449-57. PMID: 1420164

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