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Azadirachtin (AZA) is a natural bioactive agent derived from the seeds of the neem tree. Solvent extraction of neem seed cake produces neem extract (NEX). Neem-based products are commercial preparations of formulated NEX for sale as insecticides. The 96-h LC50 value of AZA (49% purity) for juvenile salmon is greater than 4 mg/L. NEX is the most toxic neem material to young salmon. The toxicity...
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