Expression of runCK.Scer\UAS under the control of Scer\GAL4MT14 results in the disappearance of the lamina plexus in the optic lobe of larvae, due to the axons of photoreceptors R2-R5 terminating in the medulla (normally they terminate at the lamina plexus).
Depending on the insertion line used, expressing runCK.UAS under the control of Scer\GAL4nos.PG results in a range of defects in head development and pair rule segmentation. As opposed to a strongly expressing insertion line, weak expression of runCK.UAS only represses the initial activation of en-positive odd-numbered parasegments, which then recover during the extended germ band stage.
Kramer