Chains and heterogens:
PDB Chain Sequences:
>1b76A (A:) aassldelvalckrrgfifqsseiygglqgvydygplgvelknnlkqawwrrnvyerddm egldasvlthrlvlhysgheatfadpmvdnakarywtppryfnmmfqdlrgprggrglla ylrpetaqgifvnfknvldatsrklgfgiaqigkafrneitprnfifrvrefeqmeieyf vrpgedeywhrywveerlkwwqemglsrenlvpyqqppessahyakatvdilyrfphgsl elegiaqrtdfdlgshtkdqealgitarvlrnehstqrlayrdpetgkwfvpyviepsag vdrgvlallaeaftreelpngeerivlklkpqlapikvaviplvknrpeiteyakrlkar llalglgrvlyedtgnigkayrrhdevgtpfavtvdydtigqskdgttrlkdtvtvrdrd tmeqirlhvdelegflrerlrw
>1b76B (B:) aassldelvalckrrgfifqsseiygglqgvydygplgvelknnlkqawwrrnvyerddm egldasvlthrlvlhysgheatfadpmvdnakarywtppryfnmmfqdlrgprggrglla ylrpetaqgifvnfknvldatsrklgfgiaqigkafrneitprnfifrvrefeqmeieyf vrpgedeywhrywveerlkwwqemglsrenlvpyqqppessahyakatvdilyrfphgsl elegiaqrtdfdlgshtkdqealgitarvlrnehstqrlayrdpetgkwfvpyviepsag vdrgvlallaeaftreelpngeerivlklkpqlapikvaviplvknrpeiteyakrlkar llalglgrvlyedtgnigkayrrhdevgtpfavtvdydtigqskdgttrlkdtvtvrdrd tmeqirlhvdelegflrerlrw