Chains and heterogens:
PDB Chain Sequences:
>1b3fA (A:) advpagvqladkqtlvrnngsevqsldphkiegvpesnvsrdlfegllisdveghpspgv aekwenkdfkvwtfhlrenakwsdgtpvtahdfvyswqrladpntaspyasylqyghian iddiiagkkpatdlgvkalddhtfevtlsepvpyfykllvhpsvspvpksavekfgdkwt qpanivtngayklknwvvnerivlernpqywdnaktvinqvtylpissevtdvnryrsge idmtynnmpielfqklkkeipnevrvdpylctyyyeinnqkapfndvrvrtalklaldrd iivnkvknqgdlpaysytppytdgaklvepewfkwsqqkrneeakkllaeagftadkplt fdllyntsdlhkklaiavasiwkknlgvnvnlenqewktfldtrhqgtfdvaragwcady neptsflntmlsdssnntahykspafdkliadtlkvaddtqrselyakaeqqldkdsaiv pvyyyvnarlvkpwvggytgkdpldniyvknlyiikh