... (m)orBS-RNase as a positive control (d).2M-ðS-S-RÞ2þ n CELL-SÀ! M-ðS-S-CELLÞ2þ M-ðSÀÞ2þ 4RSÀþ n-2 CELL-SÀð1ÞM-ðS-S-CELLÞ2þ M-ðSÀÞ2þ n-2CELL-SÀ! M-ðS-SÞ2-M þ n CELL-SÀð2Þ1982 ... bis-Cys31,Cys32-S-carboxyamidomethylated-BS-RNase;MAE, monomeric bis-Cys31,Cys32-S-aminoethylated-BS-RNase;MSSAE, monomeric bis-Cys31,Cys32-S-ethylamine-BS-RNase;MSSG, monomeric bis-Cys31,Cys32-S-glutathione-BS-RNase;CRI, cytosolic RNase ... excess, and M-(S-S)2-M is a reconsti-tuted dimer, in fact indistinguishable from nativeBS-RNase. The presence of sulphydryls on the surface of SVT2cells was tested with 5,5¢-dithio-bis(2-nitrobenzoic...