Chains and heterogens:
PDB Chain Sequences:
>1j4nA (A:) masefkkklfwravvaeflamilfifisigsalgfhypiksnqttgavqdnvkvslafgl siatlaqsvghisgahlnpavtlglllscqisvlraimyiiaqcvgaivatailsgitss lpdnslglnalapgvnsgqglgieiigtlqlvlcvlattdrrrrdlggsgplaigfsval ghllaidytgcginparsfgssvithnfqdhwifwvgpfigaalavliydfilaprssdl tdrvkvwts