part of part of develops from develops from adipocyte brown adipocyte A cell from the thermogenic form of adipose tissue found in many species, particularly in newborns and hibernating mammals, but also in lesser amounts in adults of other mammals including humans. Brown fat is capable of rapid liberation of energy and seems to be important in the maintenance of body temperature immediately after birth and upon waking from hibernation. brown fat cell FMA:83435 CALOHA:TS-0099 brown adipose cell brown preadipocyte brown adipose tissue