An approximately 6kb genomic fragment containing the wild type RpS12 locus (including snoRNA:Me28S-A774a and snoRNA:Me28S-A774b in its introns), the 5' end of the AdenoK gene and the whole of the Zmynd10 gene. An insertion sequence within the first intron of the AdenoK gene (near position 3L:13 ,022 kb) is included.