Chains and heterogens:
PDB Chain Sequences:
>7a3hA (A:) dndsvveehgqlsisngelvnergeqvqlkgmsshglqwygqfvnyesmkwlrddwginv fraamytssggyiddpsvkekvkeaveaaidldiyviidwhilsdndpniykeeakdffd emselygdypnviyeianepngsdvtwgnqikpyaeevipiirnndpnniiivgtgtwsq dvhhaadnqladpnvmyafhfyagthgqnlrdqvdyaldqgaaifvsewgtsaatgdggv fldeaqvwidfmdernlswanwslthkdessaalmpganptggwteaelspsgtfvreki res
>7a3hA (A:) svveehgqlsisngelvnergeqvqlkgmsshglqwygqfvnyesmkwlrddwginvfra amytssggyiddpsvkekvkeaveaaidldiyviidwhilsdndpniykeeakdffdems elygdypnviyeianepngsdvtwgnqikpyaeevipiirnndpnniiivgtgtwsqdvh haadnqladpnvmyafhfyagthgqnlrdqvdyaldqgaaifvsewgtsaatgdggvfld eaqvwidfmdernlswanwslthkdessaalmpganptggwteaelspsgtfvrekires