Sperm production by folt-1 knockout mutant and folt-1/+ heterozygous males. Sperm numbers within the reproductive tracts were tallied at the adult molt and one hour later. folt-1/+ heterozygous males produced wild-type numbers of sperm, but folt-1 knockout mutants had very few sperm, producing only about 3 per hour.
Austin et al. BMC Developmental Biology 2010 10:46 doi:10.1186/1471-213X-10-46