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This study focuses on the effect of octopamine (OA) on metamorphosis of the silkworm Bombyx mori and the red flour beetle Tribolium freemani Hinton. Titers of OA and juvenile-hormone esterase (JHE) were measured at various larval and pupal stadia of both insects. Effects of OA, OA agonists, and antagonists on metamorphosis and JHE activity were also examined. At day 2, peaks of OA and JHE activity...
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