>1bthK (K:) observed residues (from ATOM records)
ivegsdaeigmspwqvmlfrkspqellcgaslisdrwvltaahcllyppwdknftendll
vrigkhsrtryerniekismlekiyihprynwrenldrdialmklkkpvafsdyihpvcl
pdretaasllqagykgrvtgwgnlketwttnvgkgqpsvlqvvnlpiverpvckdstrir
itdnmfcagykpdegkrgdacqgdsggpfvmkspfnnrwyqmgivswgegcdrdgkygfy
thvfrlkkwiqkvi