Chains and heterogens:
PDB Chain Sequences:
>1g68A (A:) ssskfqqveqdvkaievslsarigvsvldtqngeywdyngnqrfpltstfktiacaklly daeqgkvnpnstveikkadlvtyspviekqvgqaitlddacfatmttsdntaaniilsav ggpkgvtdflrqigdketrldriepdlnegklgdlrdtttpkaiastlnkflfgsalsem nqkkleswmvnnqvtgnllrsvlpagwniadrsgaggfgarsitavvwsehqapiivsiy laqtqasmeerndaivkighsifdvytsqsr
>1g68A (A:) skfqqveqdvkaievslsarigvsvldtqngeywdyngnqrfpltstfktiacakllyda eqgkvnpnstveikkadlvtyspviekqvgqaitlddacfatmttsdntaaniilsavgg pkgvtdflrqigdketrldriepdlnegklgdlrdtttpkaiastlnkflfgsalsemnq kkleswmvnnqvtgnllrsvlpagwniadrsgaggfgarsitavvwsehqapiivsiyla qtqasmeerndaivkighsifdvyts