rm1131RM 1131, CNR, Harbin Bureau, Jiamusi Area, IS, 198604, 198608, 198604 : at Changchun Works, 3. DP, 199001, 199001, 1. RM 1132, Sifang 1960For many years various tetrazolium salts and their formazan products have been employed in histochemistry and for assessing cell viability. For the latter application, the most