Expression of lin-28M2.20xScer\UAS.T:Zzzz\FLAG,T:Ivir\HA1 under the control of Scer\GAL4esg.PU in adult intestinal stem cells (ISCs) and enteroblasts for two days (using the temperature sensitive Scer\GAL80ts.αTub84B line to control the timing of expression) results in a significant increase in the total number of ISCs in the posterior midgut compared to in controls.