Left, dSlo and dSLIP1 mRNAs are expressed in a coincident pattern throughout theDrosophila CNS. Lateral views of whole-mount in situ hybridization in late-stage embryos of sense (A, C) and antisense (B, D) digoxigenin-labeled riboprobes generated from dslo (A, B) and dSLIP1 (C, D) cDNAs. Strong hybridization of both antisense probes is present in the brain and ventral ganglion. In contrast to dslo, hybridization of dSLIP1 is not present in anterior sensory cells. Anterior, left; posterior,right. Right, Northern blot analysis of dSLIP1 mRNA. Poly(A+) mRNA (3 μg) extracted fromDrosophila embryos was prepared as a Northern blot and probed with a full-length radiolabeled dSLIP1 riboprobe; detected was a single band of ∼3.6 kb.