what is a circadian pacemaker?
<answer> It is in mammals is located in the suprachiasmatic nucleus in the rostroventral hypotha-lamus. <context> The master circadian pacemaker in mammals is located in the suprachiasmatic nucleus in the rostroventral hypotha-lamus (Figure 2). Lesion studies identified it in 1972, and in vitro and in vivo functional studies, as well as transplant studies, have repeatedly corroborated the finding since then.