>1sr4C (C:) observed residues (from ATOM records)
dpttypdvelsppprislrslltaqpvkndhydshnylsthwelidykgkeyeklrdggt
lvqfkvvgaakcfaflgkgttdckdtdhtvfnliptntgaflikdallgfcitshdfddl
klepcggsvsgrtfslayqwgilppfgpskilip