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(a–c) TEM investigations show the presence of CeO2 NPs in the larvae gut. Larvae fed with (a) control (normal) and (b) positively charged and (c) negatively charged NP-containing food. Insets show corresponding images at higher magnifications. It is noteworthy that lattice fringes of CeO2 NPs are clearly visible in insets of (b) and (c).
