Chains and heterogens:
PDB Chain Sequences:
>1a3hA (A:) svveehgqlsisngelvnergeqvqlkgmsshglqwygqfvnyesmkwlrddwginvfra amytssggyiddpsvkekvkeaveaaidldiyviidwhilsdndpniykeeakdffdems elygdypnviyeianepngsdvtwgnqikpyaeevipiirnndpnniiivgtgtwsqdvh haadnqladpnvmyafhfyagthgqnlrdqvdyaldqgaaifvsewgtsaatgdggvfld eaqvwidfmdernlswanwslthkdessaalmpganptggwteaelspsgtfvrekires