The E(spl)mγ-HLH open reading frame has been replaced by sfGFP. A loxP cassette containing a Disc\RFP3xP3.cUa marker has also been introduced 3' to the inserted sfGFP sequence.
E(spl)mγ-HLHnull/Df(3R)BSC751 mutant embryos display a significant increase in the number of Ap neurons, and display a significant increase in the number of EL neurons, as compared with controls.