>2bt4B (B:) SEQRES residues
mprslanapimilngpnlnllgqrqpeiygsdtladvealcvkaaaahggtvdfrqsnhe
gelvdwihearlnhcgivinpaayshtsvaildalntcdglpvvevhisnihqrepfrhh
syvsqradgvvagcgvqgyvfgveriaalagagsara