A genomic region found in DROSOPHILA. The region contains genes encoding BASIC HELIX-LOOP-HELIX TRANSCRIPTION FACTORS that play a critical role in the regulation of pattern formation during EMBRYONIC DEVELOPMENT.

Synonyms: Gene Complex, Achaete-Scute, Achaete-Scute Gene Complex, Gene Complices, Achaete-Scute, Achaete Scute Gene Complex, Achaete-Scute Complex Genome Region, Achaete Scute Complex Genome Region