Defects in neuroblasts, sensillum precursors, sensory neurons, optic lobe, somatogastric nervous system, Malpighian tubules, trachea, larval midgut, somatic musculature, cardioblasts, and peritracheal and periligament cells. The salivary gland and foregut are totally and partially absent, respectively.
Extreme embryonic neurogenic phenotype.
Nusslein-Volhard, Wieschaus.