Identification and Characterization of Neuropeptides and Their G Protein-Coupled Receptors (GPCRs) in the Cowpea Aphid <i>Aphis craccivora</i>.

For most of the measured neuropeptide-encoding genes, the expression abundance showed a trend of decreasing first and then increasing during development, i.e., the expression level was significantly downregulated at the 2 nd and 3 rd instar stages ( Figure 5 ).

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