Under ad libitum nutrition, the adulthood-only expression of Rab23UAS.cCa under the control of Scer\GAL4bab1-Pgal4-2 (and Gal80[ts] for temporal control of expression) leads to excessive or disorganized basal stalk cells, mis-shaped follicle cells and/or multilayering of the follicular epithelium, as compared to controls. Under starvation, this expression leads to a significant increase in mitotic index of the follicular epithelium, as compared to controls.