the major part of the fat body is built up of cells called trophocytes. In the young animal the trophocyte is small, comparatively clear and with large, rounded nucleus.
In due course, the cell develops cytoplasmic vacuoles and becomes enlarged due to deposits of glycogen, fats, or protein.
At metamorphosis, albuminoid granules appear in the cytoplasm and these sites are described to be definite organelles concerned with synthesis of lipids in Anthrenus.
Droplets of the enzyme lipase are associated with each droplet of fat.