>4z7vB (B:) observed residues (from ATOM records)
spedfvyqfkgmcyftngtervrlvtryiynreeyarfdsdvgvyravtplgppaaeywn
sqkevlertraeldtvcrhnyqlelrttlqrrveptvtispsllvcsvtdfypaqikvrw
fqeettgvvstplirngdwtfqilvmlemrgdvytchvehpslqnpiivewr