abbr. for Achaete-Scute complex protein; any of a family of proteins encoded by the Achaete-Scute complex, a gene cluster first discovered in
Drosophila, but with analogues in mammals and other organisms. They are involved in the determination of the neuronal precursors in the peripheral and central nervous systems. The T3, T4, and T5 proteins label strongly in the presumptive stomatogastric nervous system, while T8 is more prominent in the presumptive procephalic lobe. They resemble other members of the
MYC family of helix-turn-helix transcription factors.