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Cx(apt) = Cephalothorax(alate prothorax)
Gene: Cx
Feature/structure: Dorsal pronotum
Linkage Group:  2 
Origin: spontaneous; A. Sokoloff, Berkeley, CA.
Description: • The dorsal pronotum is taking on characteristics of the dorsum of the next most posterior segment, the mesothorax [T2]. In its strongest expression, the anterior margin of the pronotum has a large midline indentation, and the posterior midline is beginning to look like the T2 scutellum [the little roundly triangular structure just posterior to the pronotum].
Illustration:  
Illustration of Cx(apt) mutant