>1k21H (H:) observed residues (from ATOM records)
ivegsdaeigmspwqvmlfrkspqellcgaslisdrwvltaahcllyppwdknftendll
vrigkhsrtryerniekismlekiyihprynwrenldrdialmklkkpvafsdyihpvcl
pdretaasllqagykgrvtgwgnlketgqpsvlqvvnlpiverpvckdstriritdnmfc
agykpdegkrgdacegdsggpfvmkspfnnrwyqmgivswgegcdrdgkygfythvfrlk
kwiqkvidq