Del and Cuff are required for normal male fertility.
Compromised fertility of del (top) and cuff (bottom) mutant males. Sperm exhaustion test of delHN/WK or cuffWM25/QQ37 mutant (orange) and respective heterozygous sibling control (blue) males. Left: averaged numbers of offspring per male 1–11 days after eclosion (n = 5). Right: total number of progeny per male after mating for 11 days. Shaded areas and error bars display standard error. P value from unpaired t-test.