Chains and heterogens:
PDB Chain Sequences:
>1a4iA (A:) apaeilngkeisaqirarlknqvtqlkeqvpgftprlailqvgnrddsnlyinvklkaae eigikathiklprtttesevmkyitslnedstvhgflvqlpldsensinteevinaiape kdvdgltsinagrlargdlndcfipctpkgcleliketgvpiagrhavvvgrskivgapm hdlllwnnatvttchsktahldeevnkgdilvvatgqpemvkgewikpgaividcginyv pddkkpngrkvvgdvaydeakerasfitpvpggvgpmtvamlmqstvesakrfle
>1a4iA (A:) apaeilngkeisaqirarlknqvtqlkeqvpgftprlailqvgnrddsnlyinvklkaae eigikathiklprtttesevmkyitslnedstvhgflvqlpldsensinteevinaiape kdvdgltsinagrlargdlndcfipctpkgcleliketgvpiagrhavvvgrskivgapm hdlllwnnatvttchsktahldeevnkgdilvvatgqpemvkgewikpgaividcginyk vvgdvaydeakerasfitpvpggvgpmtvamlmqstvesakrfle
>1a4iB (B:) apaeilngkeisaqirarlknqvtqlkeqvpgftprlailqvgnrddsnlyinvklkaae eigikathiklprtttesevmkyitslnedstvhgflvqlpldsensinteevinaiape kdvdgltsinagrlargdlndcfipctpkgcleliketgvpiagrhavvvgrskivgapm hdlllwnnatvttchsktahldeevnkgdilvvatgqpemvkgewikpgaividcginyv pddkkpngrkvvgdvaydeakerasfitpvpggvgpmtvamlmqstvesakrfle