Chains and heterogens:
PDB Chain Sequences:
>1exuA (A:) aeshlsllyhltavsspapgtpafwvsgwlgpqqylsynslrgeaepcgawvwenqvswy wekettdlrikeklfleafkalggkgpytlqgllgcelgpdntsvptakfalngeefmnf dlkqgtwggdwpealaisqrwqqqdkaankeltfllfscphrlrehlergrgnlewkepp smrlkarpsspgfsvltcsafsfyppelqlrflrnglaagtgqgdfgpnsdgsfhasssl tvksgdehhyccivqhaglaqplrvel
>1exuA (A:) hlsllyhltavsspapgtpafwvsgwlgpqqylsynslrgeaepcgawywekettdlrik eklfleafkalggkgpytlqgllgcelgpdntsvptakfalngeefmnfdlkqgtwggdw pealaisqrwqqqdkaankeltfllfscphrlrehlergrgnlewkeppsmrlkarpssp gfsvltcsafsfyppelqlrflrnglaagtgqgdfgpnsdgsfhasssltvksgdehhyc civqhaglaqplrvel
>1exuB (B:) iqrtpkiqvysrhpaengksnflncyvsgfhpsdievdllkngeriekvehsdlsfskdw sfyllyyteftptekdeyacrvnhvtlsqpkivkwdrdm