Expression of EcRB2-E9K.Scer\UAS under the control of Scer\GAL4ETH.Switch in the presence of RU486 fully rescues the lethality and failure of ecdysis phenotypes seen in larvae expressing EcRB1-ΔC655.F645A.Scer\UAS under the control of Scer\GAL4ETH.Switch in the presence of RU486.