?CAFFEINE INJECTION IN THE DARK PHASE PROLONGS THE NOCTURNAL RISE IN SEROTONIN N-ACETYLTRANSFERASEACTIVITY AND MELATONIN CONTENT IN THE PINEAL GLAND OF MALE RATS. Pakistan Journal of Scientific & Industrial Research. 1999;42(1):27-29. Accessed March 10, 2026. https://v2.pjsir.org/index.php/biological-sciences/article/view/2102