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The proteolytic activation of prophenoloxidase (proPO) is a critical defense mechanism in insects and crustaceans. We have isolated three prophenoloxidase-activating proteinases (PAPs) from cuticular extracts or hemolymph of Manduca sexta pharate pupae, which are negatively regulated by serpin-1J and serpin-3. To test if other serpins may also inhibit the PAPs, we fractionated the induced hemolymph...
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