2.6.1.27 2-mercaptoethanol preincubation, activates 639938 2.6.1.27 additional information - 639945 2.6.1.27 additional information high salt concentrations activate 639939 2.6.1.27 additional information no activation by: pyridoxine, pyridoxal, pyridoxamine 639938, 639939 2.6.1.27 phosphate maximal activity in presence of phosphate buffer, in absence reaction proceeds at 50% of that observed in optimal phosphate concentration 639938