[Use of cytochalasin B in the micronucleus test in human peripheral lymphocytes]

The micronucleus test is one of the alternative procedures of cytogenetic analysis. Its modification with the use of cytochalasine B (Calbiochem AG) ensures safely the recording of changes of the genetic apparatus in the first cellular cycle after an attack of a mutagenic agent on human peripheral lymphocytes. The authors elaborated a reproducible modification of the original work of Fenech and Morley--published in this country by Kocisová and Srám--and describe in detail its individual steps. The cytochalasine MN-test which should become part of obligatory standard procedures of Czechoslovak preventive health services (formerly hygiene service) is thus open to confirmation.