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The cotton aphid,Aphis gossypii Glover(Hemiptera: Aphididae),is an important agricultural pest worldwide.Geranylgeranyl diphosphate synthase(GGPP synthase or GGPPS)is among the short-chain prenyltransferases.Its catalytic product GGPPS catalyzing the formation of the acyclic precursor GGPP for the biosynthesis of a variety of isoprenoids.