HEADSC 1xga SEQCRD A E GLU GLU 1 1 C C 0 SEQCRD A C CYS CYS 2 2 C C 0 SEQCRD A C CYS CYS 3 3 C C 0 SEQCRD A N ASN ASN 4 4 C C 0 SEQCRD A P PRO PRO 5 5 C C 0 SEQCRD A A ALA ALA 6 6 H H 0 SEQCRD A C CYS CYS 7 7 H H 0 SEQCRD A G GLY GLY 8 8 H H 0 SEQCRD A R ARG ARG 9 9 H H 0 SEQCRD A H HIS HIS 10 10 C C 0 SEQCRD A Y TYR TYR 11 11 C C 0 SEQCRD A S SER SER 12 12 C C 0 SEQCRD A C CYS CYS 13 13 C C 0 SEQCRD A X NH2 NH2 14 14 C C 0 PARAME method NMR PARAME resolution NA PARAME R-factor NA PARAME FreeR-factor NA