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. 2015 Nov 23;5:16823. doi: 10.1038/srep16823

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(A) l-DOPA feeding was the main factor inducing melanization of feces, an effect that was inhibited by PTU. H. armigera larvae (V-1) were fed diets containing the indicated supplements. Insets show enlarged photographs of feces following each treatment. (B–E) Detection of l-DOPA and DHI in the midgut contents (B,C) and plasma (D,E), respectively. H. armigera larvae (V-1) were fed agar containing the indicated supplements for 3 h. Larval midgut contents and hemolymph were then sampled for mass spectrometry. Each column represents the mean of three independent measurements ± S.E.M. Bar: 1 cm.