(A) Alignment of CCHa2 sequences in the indicated insect species. Conserved amino acids and bisulfide-bonded cysteine residues are highlighted in gray and yellow, respectively. (B) Effects of sugars on CCHa2 expression. Larvae were starved for 18 h, and then either further starved or re-fed with the indicated sugars for 6 h. Glucose, fructose, and trehalose, but not sucralose induced CCHa2 expression. *P < 0.05.