Chains and heterogens:
PDB Chain Sequences:
>1xc2A (A:) mnvyflgggnmaaavagglvkqggyriyianrgaekrerlekelgvetsatlpelhsddv lilavkpqdmeaacknirtngalvlsvaaglsvgtlsrylggtrrivrvmpntpgkiglg vsgmyaeaevsetdrriadrimksvgltvwlddeekmhgitgisgsgpayvfylldalqn aairqgfdmaearalslatfkgavalaeqtgedfeklqknvtskggttheaveafrrhrv aeaisegvcacvrrsqemerqyq