A comparative study was made of the spectrum of thymus cell proteins in the control and gamma-irradiated rats. It was shown that early after irradiation a group of proteins appeared in rat thymus cells which had not been traced, or detected in much lower amounts, in intact cells. Part of those polypeptides were referred to general stressor proteins, the other were specific for the effect of ionizing radiation. The spectrum of de novo synthesized enzymes changed with time after irradiation. Some of the proteins were found to induce chromatin degradation in the control cells and, presumably, to be involved in the implementation of the programmed cell death.
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