The new modification of the method of micronucleus (MN) detection without cytochalasin-B is used in this paper. The code name of the method is called "method of micronucleus detection in mononucleated cells". The basis of this method is that it makes possible to analyze MN and chromosome aberrations (CA) at the same slides. To confirm the true supposition of the authors about correlation between MN quantity and chromosome/chromatid type aberrations so called "coefficient of transformation" was calculated and it was 7.9 +/- 0.41 for the chromosome type aberrations and over 67.2 +/- 30.2 for chromatid type aberrations. Mutagenic action of gamma-irradiation and 8-methoxypsoralen (8-MOP), activated with long-wave UV-light was estimated for the first cell cycle mitosis. When compared in straight experiments results of gamma-induced MN were received by two methods: the method of cytokinesis-block (commonly used) and by the suggested method, the "coefficient of transformation" of CA into MN was 3.6, when cytochalasin-B was used and 6.7 without using it. The total data give a possibility to make a new cytological micronucleus test for mutagens revealing. As we think the modified test is more simple, more reliable less laborious and less expensive.
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