Imprecise excision has created a 2070 deletion downstream of the insertion site of P{EPg}CortactinEPg35301 to the middle of the fourth exon of the Cortactin gene.
Homozygous mutants show no visible abnormalities. When mutant ovaries are examined, they exhibit a mild defect in 'dumping' - the transfer of bulk cytoplasmic material from nurse cells to the oocyte. The size of ring canals is seriously reduced in mutant ovaries. Eggs laid by mutant mothers were on average smaller than wild-type. The hatching rate of eggs from mutant mothers is also decreased. With low penetrance (about 6% of stages 5-9 egg chambers) mutants also display discontinuities in the follicular epithelium.