>2nnaB (B:) observed residues (from ATOM records) gsrdspedfvyqfkgmcyftngtervrlvtryiynreeyarfdsdvgvyravtplgppaa eywnsqkevlertraeldtvcrhnyqlelrttlqrrveptvtispllvcsvtdfypaqik vrwfrndqeettgvvstplirngdwtfqilvmlemtpqrgdvytchvehpslqnpiivew ra