Is a potent antagonist of neurogenic gene activity during sensory organ development. The expression of distinct cell fates by the trichogen (shaft) / tormogen (socket) sister cell pair depends on the level of H activity. A certain threshold level of H activity is required, below which both sister cells adopt the tormogen fate. During embryogenesis expression is primarily in endo- and mesodermal cell layers. Ovary, embryos, larval and pupal imaginal disks. Expression peaks during embryogenesis and lowest during larval stages.