>3if6A (A:) observed residues (from ATOM records)
vvirsdwkkffsdlqaegaiviaderqakhtlsvfdqeraakryspastfkiphtlfald
adavrdefqvfrwqdqdlrsamrnstvwvyelfakdigedkarrylkqidygnvdpsgdy
widgnlkisaheqilflrklyrnqlpfkvehqrlvkdlmiteagrswilraktgwegrfg
wwvgwiewptgpvffalnidtpnrtddlfkreaiarailrsidalppn