Control of the Circadian Rhythm in Serotonin Content of the Rat Pineal Gland Circadian Rhythm Serotonin In this article, Axelrod and several members of his laboratory reported their findings on circadian rhythms and the results of a series of experiments on the pineal glands of rats. The researchers found that the circadian rhythm was synchronized by exposure to light, but otherwise operated independent of it. However, exposure to constant light, or blinding the rats altogether, significantly altered their circadian rhythms. National Academy of Sciences (U.S.), 1965 The National Academy of Sciences (U.S.), 1965 NAS, 1965 Proceedings of the National Academy of Sciences of the United States of America Snyder, Solomon H. Zweig, Mark Axelrod, Julius Fischer, Josef E. Articles Archival Materials Text 5 pages nlm:nlmuid-101584577X21-doc 101584577X21 http://resource.nlm.nih.gov/101584577X21 Profiles ID: HHAAAU English Profiles in Science