Figure 1: Schematic of precursor fat-cell clusters and fat body domains in the embryo.(a) Stage 12/13 embryo. Progenitor fat cells arise from 9 bilateral clusters of cells (yellow dots), spanning parasegments (PS) 4 through 12. In the PS13 region lies a large cluster of cells which likely make up the dorsal fat-cell projections. (b) Stage 15/16 embryo. During late stages of the embryo, mature fat cells coalesce into a single-cell thick fat body layer and most expand in the abdomen region, forming three domains: the lateral fat body, the dorsal fat-cell projection and the ventral collar.