Enkephalins play a major role in reproductive physiology in crustaceans; however their role in reproductive development in insects is largely unknown. We investigated the effect of exposure to exogenous leucine-enkephalin (Leu-Enk). methionine-enkephalin (Met-Enk). and the opioid antagonist naloxone on gonad development in the Eastern lubber grasshopper. https://danddcollectiblers.shop/product-category/uptown/