[Duration of the mitotic cycle and radiosensitivity of chromosomes in human lymphocytes]

The frequency of chromosome aberrations was studied in human lymphocytes, with different duration of the mitotic cycle (from 48 to 73 h), exposed to gamma-quanta 2 h before fixation (i. e. at the G2 stage). In all cases both the types and the frequencies of aberrations were the same; this was an argument against the assumption about the existence of populations varying by radiosensitivity of chromosomes.