Chains and heterogens:
PDB Chain Sequences:
>1sg1A (A:) ssshpifhrgefsvcdsvsvwvgdkttatdikgkevmvlgevninnsvfkqyffetkcrd pnpvdsgcrgidskhwnsycttthtfvkaltmdgkqaawrfiridtacvcvlsrkavrra
>1sg1A (A:) efsvcdsvsvwvgdkttatdikgkevmvlgevninnsvfkqyffetkcrdgcrgidskhw nsycttthtfvkaltmdgkqaawrfiridtacvcvlsrk
>1sg1B (B:) ssshpifhrgefsvcdsvsvwvgdkttatdikgkevmvlgevninnsvfkqyffetkcrd pnpvdsgcrgidskhwnsycttthtfvkaltmdgkqaawrfiridtacvcvlsrkavrra
>1sg1B (B:) rgefsvcdsvsvwvgdkttatdikgkevmvlgevninnsvfkqyffetkcrdgcrgidsk hwnsycttthtfvkaltmdgkqaawrfiridtacvcvlsrka
>1sg1X (X:) ketcstglythsgecckacnlgegvaqpcganqtvcepcldnvtfsdvvsatepckpcte clglqsmsapcveaddavcrcaygyyqdeetghceacsvcevgsglvfscqdkqntvcee cpegtysdeanhvdpclpctvcedterqlrectpwadaece
>1sg1X (X:) etcstglythsgecckacnlgegvaqpcganqtvcepcldnvtfsdvvsatepckpctec lglqsmsapcveaddavcrcaygyyqdeetghceacsvcevgsglvfscqdkqntvceec pegtysdeanhvdpclpctvcedterqlrectpwadaece