HEADSC 5xiv SEQCRD A Y TYR TYR 1 1 C C 0 SEQCRD A E GLU GLU 2 2 C C 0 SEQCRD A T THR THR 3 3 C C 0 SEQCRD A G GLY GLY 4 4 C C 0 SEQCRD A C CYS CYS 5 5 C C 0 SEQCRD A K LYS LYS 6 6 C C 0 SEQCRD A R ARG ARG 7 7 C C 0 SEQCRD A C CYS CYS 8 8 C C 0 SEQCRD A C CYS CYS 9 9 C C 0 SEQCRD A Y TYR TYR 10 10 C C 0 SEQCRD A L LEU LEU 11 11 C C 0 SEQCRD A D ASP ASP 12 12 C C 0 SEQCRD A E GLU GLU 13 13 C C 0 SEQCRD A Y TYR TYR 14 14 C C 0 SEQCRD A G GLY GLY 15 15 C C 0 SEQCRD A C CYS CYS 16 16 C C 0 SEQCRD A I ILE ILE 17 17 C C 0 SEQCRD A R ARG ARG 18 18 C C 0 SEQCRD A C CYS CYS 19 19 C C 0 SEQCRD A C CYS CYS 20 20 C C 0 PARAME method NMR PARAME resolution NA PARAME R-factor NA PARAME FreeR-factor NA