Morphology.- The Pineal Gland of Mammals: Some Open Morphological Questions.- Demonstration of Nerve Fibers Immunoreactive to met-Enkephalin, leu-Enkephalin, and -Endorphin in the Bovine Pineal Gland.- Comparative Studies of VIP-, PHI-, and NPY-Immunoreactive Nerve Fibers in the Pineal Gland of the Sheep.- Biochemistry.- Pharmacological Regulation of Receptor-Mediated Indoleamine Metabolism in the Mammalian Pineal Gland.- Regulation of Melatonin...