Expression of Tom^Scer\UAS.cZa under the control of both Scer\GAL4^how-24B and Scer\GAL4^twi.PG results in embryos with larger or duplicated muscle 1 syncytia. The number of adult muscle precursor cells is significantly increased. The number of slou-expressing progenitors in the mesodermal clusters I and II is increased. There is an increase in the number of progenitors and syncytial nuclei of muscle 8. Many supernumerary cardioblasts are formed in the dorsal vessel. Expression of Tom^Scer\UAS.cZa under the control of Scer\GAL4^pnr-MD237 leads to an excess of dorsocentral macrochaetae and microchaetae on the notum, and additional macrochaetae in the dorsal region of the head, such as duplication of the orbital macrochaetae. Duplication of bristles is associated with an increase or duplication of socket structures.