Nucleotide substitution: G?A. Mutation in a conserved exon/intron boundary, which is predicted to result in a truncated protein that lacks the last 80 amino acids.
simjL/simj16 animals survive to the late pupal stage. The pupae appear almost wild-type, but do display a variety of phenotypes, including short third legs. simjA/simjL pupae sometimes show necrosis hear the head region.
Order of alleles (from weak to strong) is: simj16, simj7, simjL, simjS, simjH, simjJ = simj10 = simjA = Df(3L)lxd6.