Iodoacetic AcidIodoacetatesHydrocarbons, IodinatedIodoacetamideCysteineAlkylationGlycolysisDinitrophenolsSulfhydryl CompoundsDisulfidesHydrogen-Ion ConcentrationSulfhydryl ReagentsCyanidesKineticsDithiothreitolEndopeptidasesAmino AcidsEthylmaleimideAmino Acid SequenceMolecular WeightTrypsinBinding SitesAdenosine TriphosphateCysteine EndopeptidasesElectrophoresis, Polyacrylamide GelMolecular Sequence DataMusclesSubstrate Specificity