UASp regulatory sequences drive expression of Rap1 that has been mutated so that it is locked in the GDP-bound off state. The protein is tagged at the N-terminal end with GFP.
embryo | dorsal closure stage, with Scer\GAL4c381
Expression of RS17A.Scer\UAS.P\T in the amnioserosa under the control of Scer\GAL4c381 results in dorsal closure and germband retraction failure.