Chains and heterogens:
PDB Chain Sequences:
>1n57A (A:) mtvqtsknpqvdiaednaffpseyslsqytspvsdldgvdypkpyrgkhkilviaadery lptdngklfstgnhpietllplyhlhaagfefevatisglmtkfeywamphkdekvmpff eqhkslfrnpkkladvvaslnadseyaaifvpgghgaliglpesqdvaaalqwaikndrf vislchgpaaflalrhgdnplngysicafpdaadkqtpeigympghltwyfgeelkkmgm niindditgrvhkdrklltgdspfaanalgklaaqemlaayaglehhhhhh
>1n57A (A:) tsknpqvdiaednaffpseyslsqytspvsdldgvdypkpyrgkhkilviaaderylptd ngklfstgnhpietllplyhlhaagfefevatisglmtkfeywamphkdekvmpffeqhk slfrnpkkladvvaslnadseyaaifvpgghgaliglpesqdvaaalqwaikndrfvisl chgpaaflalrhgdnplngysicafpdaadkqtpeigympghltwyfgeelkkmgmniin dditgrvhkdrklltgdspfaanalgklaaqemlaayag