Mobilisation of P{GawB}locoC139 resulting in two insertions in reverse orientation at the original insertion site (322 bp upstream of exon 2). The P-element insertions of loco are flanked by a 9 bp duplication of genomic sequence (GATCGAGGT).
loco318 mutant testes are smaller and thinner compared to wild-type. The testes contain mobile sperm.