Chains and heterogens:
PDB Chain Sequences:
>1efvA (A:) qstlviaehandslapitlntitaatrlggevsclvagtkcdkvaqdlckvagiakvlva qhdvykgllpeeltplilatqkqfnythicagasafgknllprvaaklevapisdiiaik spdtfvrtiyagnalctvkcdekvkvfsvrgtsfdaaatsggsassekasstspveisew ldqkltksdrpeltgakvvvsggrglksgenfkllydladqlhaavgasraavdagfvpn dmqvgqtgkivapelyiavgisgaiqhlagmkdsktivainkdpeapifqvadygivadl fkvvpemteilk
>1efvB (B:) lrvlvavkrvidyavkirvkpdrtgvvtdgvkhsmnpfceiaveeavrlkekklvkevia vscgpaqcqetirtalamgadrgihvevppaeaerlgplqvarvlaklaekekvdlvllg kqaidddcnqtgqmtagfldwpqgtfasqvtlegdklkvereidggletlrlklpavvta dlrlnepryatlpnimkakkkkievikpgdlgvdltsklsvisvedppqrtagvkvette dlvaklkeigri