Effect of photoperiod on early changes in the neonatal rat pineal gland.
D000818:Animals; D000831:Animals, Newborn / Q000254:growth & development*; D005260:Female; D008027:Light; D008938:Mitosis; D010870:Pineal Gland / Q000166:cytology / Q000254:growth & development* / Q000502:physiology; D051381:Rats; D013997:Time Factors