Chains and heterogens:
PDB Chain Sequences:
>1px7A (A:) ppytvvyfpvrgrcaalrmlladqgqswkeevvtvetwqegslkasclygqlpkfqdgdl tlyqsntilrhlgrtlglygkdqqeaalvdmvndgvedlrckyisliytnyeagkddyvk alpgqlkpfetllsqnqggktfivgdqisfaeynlldlllihevlapgcldafpllsayv grlsarpklkaflaspeyvnlpingngkq
>1px7B (B:) ppytvvyfpvrgrcaalrmlladqgqswkeevvtvetwqegslkasclygqlpkfqdgdl tlyqsntilrhlgrtlglygkdqqeaalvdmvndgvedlrckyisliytnyeagkddyvk alpgqlkpfetllsqnqggktfivgdqisfaeynlldlllihevlapgcldafpllsayv grlsarpklkaflaspeyvnlpingngkq
>1px7B (B:) pytvvyfpvrgrcaalrmlladqgqswkeevvtvetwqegslkasclygqlpkfqdgdlt lyqsntilrhlgrtlglygkdqqeaalvdmvndgvedlrckyisliytnyeagkddyvka lpgqlkpfetllsqnqggktfivgdqisfaeynlldlllihevlapgcldafpllsayvg rlsarpklkaflaspeyvnlpingngkq