Chains and heterogens:
PDB Chain Sequences:
>1exuA (A:) hlsllyhltavsspapgtpafwvsgwlgpqqylsynslrgeaepcgawvwenqvswywek ettdlrikeklfleafkalggkgpytlqgllgcelgpdntsvptakfalngeefmnfdlk qgtwggdwpealaisqrwqqqdkaankeltfllfscphrlrehlergrgnlewkeppsmr lkarpsspgfsvltcsafsfyppelqlrflrnglaagtgqgdfgpnsdgsfhasssltvk sgdehhyccivqhaglaqplrvel
>1exuA (A:) hlsllyhltavsspapgtpafwvsgwlgpqqylsynslrgeaepcgawywekettdlrik eklfleafkalggkgpytlqgllgcelgpdntsvptakfalngeefmnfdlkqgtwggdw pealaisqrwqqqdkaankeltfllfscphrlrehlergrgnlewkeppsmrlkarpssp gfsvltcsafsfyppelqlrflrnglaagtgqgdfgpnsdgsfhasssltvksgdehhyc civqhaglaqplrvel
>1exuB (B:) iqrtpkiqvysrhpaengksnflncyvsgfhpsdievdllkngeriekvehsdlsfskdw sfyllyyteftptekdeyacrvnhvtlsqpkivkwdrdm