Imprecise excision of the insertion in JYalphaKG09295, resulting in a protein that is truncated after the first 268 amino acids.
Homozygous males show sterility (as assayed by the degree of sperm motility).
JYalpha8c results in hybrid sterility (as assayed by the degree of sperm motility) when heterozygous in males containing the D.simulans 4th chromosome introgressed into an otherwise D.melanogaster background.