A,
Dscam was conditionally targeted with Brn3b-Cre, which is expressed in the midbrain and retina, but does not result in hydrocephalus, as visualized with the ai9 reporter. B and C, Axon remodeling was observed after conditionally targeting Dscam with Brn3b-Cre (C) but not in Cre-negative controls (B). N≥3. Scale bar (in B) B-H = 100 μm in B and C.