Chains and heterogens:
PDB Chain Sequences:
>1f3rB (B:) qvqllesgpglvrpsetlsltctvsgfsltsfsvswvrhpsgkgpewmgrmwydgytayn salksrlsisrdtsknqvflkmnslqtddtgtyyctrdlyggyplgfwyfdfwgpgtmvt vssggggsggggsggggsdikltqspsllsasvgdrvtlsckgsqninnylawyqqklge apklliyntnslqtgipsrfsgsgsgtdytltisslqpedvatyfcyqynngytfgagtk lelkaaeqkliseedln