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(A) Midgut epithelium of a second instar Leptinotarsa decemlineata larvae fed artificial diet alone. (B) Midgut epithelium of a second instar L. decemlineata larvae fed artificial diet containing 1.7 ppm Tca for 24 h. The gut epithelium is severely disrupted, and the gut lumen is packed with cellular debris (scale bars = 50 µm)
