Chains and heterogens:
PDB Chain Sequences:
>1pb1A (A:) meskvvvpaqgkkitlqngklnvpenpiipyiegdgigvdvtpamlkvvdaavekaykge rkiswmeiytgekstqvygqdvwlpaetldlireyrvaikgplttpvgggirslnvalrq eldlyiclrpvryyqgtpspvkhpeltdmvifrensediyagiewkadsadaekvikflr eemgvkkirfpehcgigikpcseegtkrlvraaieyaiandrdsvtlvhkgnimkftega fkdwgyqlareefggelidggpwlkvknpntgkeivikdviadaflqqillrpaeydvia cmnlngdyisdalaaqvggigiapganigdecalfeathgtapkyagqdkvnpgsiilsa emmlrhmgwteaadlivkgmegainaktvtydferlmdgakllkcsefgdaiienm