High resolution autoradiographic study of normal lactating mammary gland and mammary tumors of the mouse: preliminary report.

Protein metabolism of normal lactating gland and mammary tumor cells was studied with high resolution autoradiography. Special attention was devoted to the Golgi zone in both cell types because of the involvement of this structure in milk protein secretion in the normal gland cell and the topographical relation of this apparatus with viral "inclusion bodies" in the tumor. In the normal gland, the cycle of protein secretion was completed in about 50 minutes, the main part of the cycle being represented by a heavy and extensive labeling of the Golgi zone.

SEROTONIN RHYTHM IN THE PINEAL ORGAN: CONTROL BY THE SYMPATHETIC NERVOUS SYSTEM.

The serotonin content of the pineal organ of the rat varies diurnally in relation to the photoperiod. When the sympathetic nerves to the pineal are interrupted by the removal of the superior cervical ganglia, no such fluctuation in the serotonin content of the pineal occurs.