A 1.2kb restriction fragment containing a copy of the sev enhancer guides the expression of a mutated R sequence expressed from an Hsp70 promoter.
eye
ommatidium
photoreceptor cell R7
Eyes of RN17.hs2sev mutants are rough when viewed from the exterior and, when sectioned, show a roughened-like phenotype; the majority of ommatidia lack R7 photoreceptors, and other cells are lost at a lower frequency.