Chains and heterogens:
PDB Chain Sequences:
>1h73A (A:) mkvrvkapctsanlgvgfdvfglclkepydvieveaiddkeiiievddkniptdpdknva givakkmiddfnigkgvkitikkgvkagsglgssaassagtayainelfklnldklklvd yasygelassgakhadnvapaifggftmvtnyeplevlhipidfkldiliaipnisintk eareilpkavglkdlvnnvgkacgmvyalynkdkslfgrymmsdkviepvrgklipnyfk ikeevkdkvygitisgsgpsiiafpkeefidevenilrdyyentirtevgkgvevv