Chains and heterogens:
PDB Chain Sequences:
>1an8_ (-) kkdisnvksdllyaytitpydykdcrvnfstthtlnidtqkyrgkdyyissemsyeasqk fkrddhvdvfglfyilnshtgeyiyggitpaqnnkvnhkllgnlfisgesqqnlnnkiil ekdivtfqeidfkirkylmdnykiydatspyvsgrieigtkdgkheqidlfdspnegtrs difakykdnriinmknfshfdiylek