Chains and heterogens:
PDB Chain Sequences:
>1on2A (A:) mttpsmemyieqiymlieekgyarvsdiaealavhpssvtkmvqkldkdeyliyekyrgl vltskgkkigkrlvyrhelleqflriigvdeekiyndvegiehhlswnsidrigdlvqyf eeddarkkdlksiqkktehhnq
>1on2A (A:) ttpsmemyieqiymlieekgyarvsdiaealavhpssvtkmvqkldkdeyliyekyrglv ltskgkkigkrlvyrhelleqflriigvdeekiyndvegiehhlswnsidrigdlvqyfe eddarkkdlksiqkk
>1on2B (B:) mttpsmemyieqiymlieekgyarvsdiaealavhpssvtkmvqkldkdeyliyekyrgl vltskgkkigkrlvyrhelleqflriigvdeekiyndvegiehhlswnsidrigdlvqyf eeddarkkdlksiqkktehhnq
>1on2B (B:) ttpsmemyieqiymlieekgyarvsdiaealavhpssvtkmvqkldkdeyliyekyrglv ltskgkkigkrlvyrhelleqflriigvdeekiyndvegiehhlswnsidrigdlvqyfe eddarkkdlksiqkk