Chains and heterogens:
PDB Chain Sequences:
>1u19A (A:) mngtegpnfyvpfsnktgvvrspfeapqyylaepwqfsmlaaymfllimlgfpinfltly vtvqhkklrtplnyillnlavadlfmvfggftttlytslhgyfvfgptgcnlegffatlg geialwslvvlaieryvvvckpmsnfrfgenhaimgvaftwvmalacaapplvgwsryip egmqcscgidyytpheetnnesfviymfvvhfiipliviffcygqlvftvkeaaaqqqes attqkaekevtrmviimviaflicwlpyagvafyifthqgsdfgpifmtipaffaktsav ynpviyimmnkqfrncmvttlccgknplgddeasttvsktetsqvapa
>1u19B (B:) mngtegpnfyvpfsnktgvvrspfeapqyylaepwqfsmlaaymfllimlgfpinfltly vtvqhkklrtplnyillnlavadlfmvfggftttlytslhgyfvfgptgcnlegffatlg geialwslvvlaieryvvvckpmsnfrfgenhaimgvaftwvmalacaapplvgwsryip egmqcscgidyytpheetnnesfviymfvvhfiipliviffcygqlvftvkeaaaqqqes attqkaekevtrmviimviaflicwlpyagvafyifthqgsdfgpifmtipaffaktsav ynpviyimmnkqfrncmvttlccgknplgddeasttvsktetsqvapa