Chains and heterogens:
PDB Chain Sequences:
>1xs2A (A:) mahtgrmfkieaaeivvarlplkfrfetsfgvqthkvvpllilhgegvqgvaegtmearp myreetiagaldllrgtflpailgqtfanpeavsdalgsyrgnrmaramvemaawdlwar tlgvplgtllgghkeqvevgvslgiqadeqatvdlvrrhveqgyrriklkikpgwdvqpv ratreafpdirltvdansaytladagrlrqldeydltyieqplawddlvdhaelarrirt plcldesvasasdarkalalgaggvinlkvarvgghaesrrvhdvaqsfgapvwcggmle sgigrahnihlstlsnfrlpgdtssasrywerdliqepleavdglmpvpqgpgtgvtldr eflatvteaqeehra
>1xs2A (A:) rmfkieaaeivvarlplkthkvvpllilhgegvqgvaegtmearpmyreetiagaldllr gtflpailgqtfanpeavsdalgsyrgnrmaramvemaawdlwartlgvplgtllgghke qvevgvslgiqadeqatvdlvrrhveqgyrriklkikpgwdvqpvratreafpdirltvd ansaytladagrlrqldeydltyieqplawddlvdhaelarrirtplcldesvasasdar kalalgaggvinlkvarvgghaesrrvhdvaqsfgapvwcggmlesgigrahnihlstls nfrlpgdtssasrywerdliqepleavdglmpvpqgpgtgvtldreflatvteaqeehra
>1xs2B (B:) mahtgrmfkieaaeivvarlplkfrfetsfgvqthkvvpllilhgegvqgvaegtmearp myreetiagaldllrgtflpailgqtfanpeavsdalgsyrgnrmaramvemaawdlwar tlgvplgtllgghkeqvevgvslgiqadeqatvdlvrrhveqgyrriklkikpgwdvqpv ratreafpdirltvdansaytladagrlrqldeydltyieqplawddlvdhaelarrirt plcldesvasasdarkalalgaggvinlkvarvgghaesrrvhdvaqsfgapvwcggmle sgigrahnihlstlsnfrlpgdtssasrywerdliqepleavdglmpvpqgpgtgvtldr eflatvteaqeehra
>1xs2B (B:) rmfkieaaeivvarlplkthkvvpllilhgegvqgvaegtmearpmyreetiagaldllr gtflpailgqtfanpeavsdalgsyrgnrmaramvemaawdlwartlgvplgtllgghke qvevgvslgiqadeqatvdlvrrhveqgyrriklkikpgwdvqpvratreafpdirltvd ansaytladagrlrqldeydltyieqplawddlvdhaelarrirtplcldesvasasdar kalalgaggvinlkvarvgghaesrrvhdvaqsfgapvwcggmlesgigrahnihlstls nfrlpgdtssasrywerdliqepleavdglmpvpqgpgtgvtldreflatvteaqeehra
>1xs2C (C:) mahtgrmfkieaaeivvarlplkfrfetsfgvqthkvvpllilhgegvqgvaegtmearp myreetiagaldllrgtflpailgqtfanpeavsdalgsyrgnrmaramvemaawdlwar tlgvplgtllgghkeqvevgvslgiqadeqatvdlvrrhveqgyrriklkikpgwdvqpv ratreafpdirltvdansaytladagrlrqldeydltyieqplawddlvdhaelarrirt plcldesvasasdarkalalgaggvinlkvarvgghaesrrvhdvaqsfgapvwcggmle sgigrahnihlstlsnfrlpgdtssasrywerdliqepleavdglmpvpqgpgtgvtldr eflatvteaqeehra
>1xs2C (C:) rmfkieaaeivvarlplkthkvvpllilhgegvqgvaegtmearpmyreetiagaldllr gtflpailgqtfanpeavsdalgsyrgnrmaramvemaawdlwartlgvplgtllgghke qvevgvslgiqadeqatvdlvrrhveqgyrriklkikpgwdvqpvratreafpdirltvd ansaytladagrlrqldeydltyieqplawddlvdhaelarrirtplcldesvasasdar kalalgaggvinlkvarvgghaesrrvhdvaqsfgapvwcggmlesgigrahnihlstls nfrlpgdtssasrywerdliqepleavdglmpvpqgpgtgvtldreflatvteaqeehra
>1xs2D (D:) mahtgrmfkieaaeivvarlplkfrfetsfgvqthkvvpllilhgegvqgvaegtmearp myreetiagaldllrgtflpailgqtfanpeavsdalgsyrgnrmaramvemaawdlwar tlgvplgtllgghkeqvevgvslgiqadeqatvdlvrrhveqgyrriklkikpgwdvqpv ratreafpdirltvdansaytladagrlrqldeydltyieqplawddlvdhaelarrirt plcldesvasasdarkalalgaggvinlkvarvgghaesrrvhdvaqsfgapvwcggmle sgigrahnihlstlsnfrlpgdtssasrywerdliqepleavdglmpvpqgpgtgvtldr eflatvteaqeehra
>1xs2D (D:) rmfkieaaeivvarlplkthkvvpllilhgegvqgvaegtmearpmyreetiagaldllr gtflpailgqtfanpeavsdalgsyrgnrmaramvemaawdlwartlgvplgtllgghke qvevgvslgiqadeqatvdlvrrhveqgyrriklkikpgwdvqpvratreafpdirltvd ansaytladagrlrqldeydltyieqplawddlvdhaelarrirtplcldesvasasdar kalalgaggvinlkvarvgghaesrrvhdvaqsfgapvwcggmlesgigrahnihlstls nfrlpgdtssasrywerdliqepleavdglmpvpqgpgtgvtldreflatvteaqeehra