>1extB (B:) SEQRES residues mdsvcpqgkyihpqnnsicctkchkgtylyndcpgpgqdtdcrecesgsftasenhlrhc lscskcrkemgqveissctvdrdtvcgcrknqyrhywsenlfqcfncslclngtvhlscq ekqntvctchagfflrenecvscsnckkslectklclpqien