>2bt4F (F:) observed residues (from ATOM records) rslanapimilngpnlnllgqrqpeiygsdtladvealcvkaaaahggtvdfrqsnhege lvdwihearlnhcgivinpaayshtsvaildalntcdglpvvevhisnihqrepfrhhsy vsqradgvvagcgvqgyvfgveriaalag