(1) Department of Anatomy, Mahidol University, Rama VI Road, Bangkok 4, (Thailand);(2) Present address: Department of Anatomy, Saint Louis University School of Medicine, 1402 South Grand Boulevard, 63104 St. Louis, Missouri, USA
Abstract:
Summary It is concluded that photoperiod has little direct effect on the mitotic activity or morphological development of the pineal parenchymal cell of the rat in the early postnatal period.