W. K. TrakulrungsiV. L. YeagerMahidol University2018-03-222018-03-221977-01-01Experientia. Vol.33, No.1 (1977), 84-8514209071001447542-s2.0-0017337326https://repository.li.mahidol.ac.th/handle/123456789/10238It 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. © 1977 Birkhäuser Verlag.Mahidol UniversityBiochemistry, Genetics and Molecular BiologyArticleSCOPUS10.1007/BF01936768