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Inhibition of chymotrypsin activity by NaPI and StPin1A. Unfractionated gut extract (1 μg protein) from H. armigera and H. punctigera larvae was incubated with increasing concentrations of native purified NaPI and recombinant StPin1A before the addition of chymotrypsin substrate (Succ-AAPFpNA). The residual activity is expressed as percent chymotrypsin remaining compared with controls. Error bars show SEM of three independent experiments performed in duplicate.
