In order to monitor in Drosophila the expression of the iab - 8ncARN in vivo, I decided to introduce a sequence encoding the fluorescent protein " mCherry " in exon 3 of the iab - 8ncARN . The choice of this exon is dictated by the existence of an integration platform in the iab-6 domain that encodes exon 3 . I managed the integration of the reporter gene using the technique of recombineering and transformation of Drosophila with integrase phiC31 . I discovered that a truncated form of the iab - 8ncARN is expressed specifically in the secondary cells of glands of the reproductive system in males that become fluorescent . I have not yet succeeded to detect expression of mCherry in embryos.