Embryos laid by mothers carrying Ptenc494 germ-line clones have expanded tracheal primordia (placodes) at stage 11. The thoracic tracheal primordia and abdominal primordia 1 and 2 are most affected. Ectopic tracheal placodes are also sometimes present.
Lethality acts at the late embryonic/early first larval instar phase. Clones induced in the eye have ommatidia that are larger than their wild type neighbors. Photoreceptor cell composition and orientation are normal. Individual mutant cells are larger than wild type. The mutant phenotype is cell autonomous. No overproliferation defect occurs.