P element insertion at 86E1--86E2.
Heterozygous males start to court mature wild-type CantonS females at 13 hours old (wild-type CantonS males start courting mature females at 17 hours old). The mutant males also mate earlier than control males: when 17 hours old, 15% of mutant heterozygous males mate during the first 10 minutes and 31% mate during the first 60 minutes (wild-type CantonS males initiate copulation only when 28 hours old).
No obvious CNS defects.
Weak pros allele.