Cell cycle progression of murine sarcoma cells after x irradiation or heat shock

DNA histograms of exponentially growing EMT-6 (cultured mammary sarcoma) cells in vitro were obtained at regular time intervals after exposure to 300 rads of x rays or one hour of heat shock at 430C. After either treatment, about 70 percent of the cells retained clonogenicity. Irradiation induced the expected block in the G2 + M phase, resulting in an increase of cells in that phase during the first 5 hours after exposure. Heat shock caused a block in both the S and G2 + M phases. (auth)