... isoforms, isoenzymes, monomeric forms;assay for selective cytotoxicity of the enzyme. Methods Enzymol.341, 248–263.13. Kunitz, M. (1946) A spectrophotometric method for the meas-urement of ... in the presence of 10 mMIAM, or (C) of 50 mMIAM. D and M mark the elution volumes of BS-RNase and monomeric BS-RNase, respectively.Ó FEBS 2003 Disulfides and antitumor action of BS-RNase (Eur. ... concentrations of PM. Inset, autoradiographic scans of the SDS/PAGE runs of 125I-labelled MSSAE detached by high salt from PM. D and M mark the electrophoretic mobilities of BS-RNase and monomeric...