Terminal differentiation of the adipose tissue in relation to vitellogenesis in the cricket.

Changes in fat body cell ultrastructure were followed in the female cricket during the first days of adult life (at the onset of vitellogenesis). Cytological evidence was obtained for the depletion of stored lipids, and correlative accumulation of glycogen, in connection with lipidic vitellogenesis. The production of glycoproteic yolk precursors is achieved by the adipose cells following a process of terminal differentiation which transforms into secretory cells. The whole process occurs within the four first days of adult life.