Abstract
Chromosome numbers have been studied in a HeLa cell population sensitive to the inhibitory influences of desoxycorticosterone and testosterone (strain HuE) and in its sub-lines d and t resistant to desoxycorticosterone and testosterone, respectively. It has been found that strain HuE has a stem line of 68 chromosomes, while both the steroid- resistant sub-lines exhibit stem lines of 74. The data suggest that steroid “resistancy” in the cell strain and sub-lines is due to more subtle variations than a net increase of 6 chromosomes.