The male recombination technique, using a chromosome carrying P{SUPor-P}cnn^Scim, has resulted in a deletion that spans from the first intron to 1.6kb downstream of the end of the last exon (exon 7) of cnn. The first exon of the maternal transcript is retained, which encodes the first 62 amino acids of cnn. The deletion also removes the first small exon of the neighbouring CG42321 gene. The chromosome retains the P{SUPor-P}cnn^Scim insertion.