Fat cells with dark coloration due to the densely packed MITOCHONDRIA. They contain numerous small lipid droplets or vacuoles. Their stored lipids can be converted directly to energy as heat by the mitochondria.

Synonyms: Brown Fat Cells, Adipocyte, Brown, Cell, Brown Fat, Cells, Brown Fat, Fat Cell, Brown, Adipocytes, Brown, Brown Adipocyte, Brown Adipocytes, Fat Cells, Brown, Brown Fat Cell