Chains and heterogens:
PDB Chain Sequences:
>1y57A (A:) mvttfvalydyesrtetdlsfkkgerlqivnntegdwwlahslstgqtgyipsnyvapsd siqaeewyfgkitrreserlllnaenprgtflvresettkgayclsvsdfdnakglnvkh ykirkldsggfyitsrtqfnslqqlvayyskhadglchrlttvcptskpqtqglakdawe ipreslrlevklgqgcfgevwmgtwngttrvaiktlkpgtmspeaflqeaqvmkklrhek lvqlyavvseepiyivteymskgslldflkgetgkylrlpqlvdmaaqiasgmayvermn yvhrdlraanilvgenlvckvadfglarliedneytarqgakfpikwtapeaalygrfti ksdvwsfgilltelttkgrvpypgmvnrevldqvergyrmpcppecpeslhdlmcqcwrk epeerptfeylqafledyftstepqyqpgenl