The point mutation within the moi coding sequence (the upstream open reading frame (ORF) of a dicistronic transcript that encodes both moi and Tgs1) also affects Tgs1 (the downstream ORF of the dicistronic transcript); in the presence of a transgene encoding moi[+], homozygotes for the mutation show substantially reduced levels of Tps1 protein compared to heterozygotes. FlyBase curator comment: the moi1 allele represents the effect of the point mutation on the moi ORF, while the Tgs1m1 allele represents the effect on Tgs1.