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Selenium is an important dietary micronutrient and an essential component of selenoproteins and the active sites of some enzymes, although at high concentrations it is toxic. We investigated diphenyl diselenide ((C 6 H 5 ) 2 Se 2 ) for its effects on the developmental stages of Drosophila melanogaster and found that in the larval and pupae stages the toxic threshold for this compound when added to the banana-agar medium on which the larva were fed was 350 μmol. In adult flies, fed on the samedoi:10.1590/s1415-47572008000100022 fatcat:zb3cowxzlzgo3lx7ftz4iayi5i