“?CAFFEINE INJECTION IN THE DARK PHASE PROLONGS THE NOCTURNAL RISE IN SEROTONIN N-ACETYLTRANSFERASEACTIVITY AND MELATONIN CONTENT IN THE PINEAL GLAND OF MALE RATS”. Biological Sciences - PJSIR 42, no. 1 (February 22, 1999): 27–29. Accessed April 25, 2026. http://www.v2.pjsir.org/index.php/biological-sciences/article/view/2102.