“…Hepatocytes exhibit circadian variation at the biochemical, morphological, and ultrastructural levels (Bourdel and Forestier, 1982;Castillo et al, 1983;Echave Llanos et al, 1970;Gurr et al, 1978;Hardeland et al, 1973;Kinlaw et al, 1987;Lavigne et al, 1983;Phillipens et al, 1977;Potter et al, 1966;Ruby et al, 1973;Scheving et al, 1987;Seifert, 1980;Steinhardt, 1971; Yeh et al, 1981). This is in part because of the fact that the intestinal nutrients and neuropeptides are released into the portal tract as a consequence of nocturnal feeding.…”