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Odorant-binding proteins (OBPs) and chemosensory proteins (CSPs) are soluble polypeptides presents at the interface between the external environment and chemoreceptors in insects.They play an important role in odorant detection during the process of insects olfaction.The Lepidoptera species Helicoverpa armigera (Hübner) is a polyphagous pest of agricultural importance all over the world.