>1z3uB (B:) observed residues (from ATOM records)
sfrdcaevfksghttngiytltfpnsteeikaycdmeaggggwtiiqrredgsvdfqrtw
keykvgfgnpsgeywlgnefvsqltnqqryvlkihlkdwegneayslyehfylsseelny
rihlkgltgtagkissisqpgndfstkdgdndkcickcsqmltggwwfdacgpsnlngmy
ypqrqntnkangikwaawkgsgyslkattmmirpad