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Summary
The heads of intact rats and of rats 15 days after adrenalectomy were irradiated with 1200 R. Some of the adrenalectomized animals with irradiated heads were treated with 5 mg of deoxycorticosterone acetate. In adrenocorticotropic cells of adrenalectomized rats 15 and 30 days after irradiation, the decreased amount of the granular endoplasmic reticulum and the Golgi regression imply a considerably decreased protein synthesis. The finding of an increased number of granules and of granules larger than normal suggests that they are the result of slowed down transport and secretion of the products of these cells' activities.
After head irradiation an increased number of degenerative cells was evident in the pituitary of both intact and adrenalectomized rats. The degree of the degenerative changes and the number of degenerative cells was higher 30 than 15 days after irradiation and both were decreased if the adrenalectomized rats were treated with deoxycorticosterone acetate.