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Representative gut-on-a-chip systems for understanding nanoparticle induced toxicity. (A) A primary human small intestine-on-a-chip using biopsy-derived organoid. Mucine producing cells (Muc5AC: green) are primarily found along the apical regions of the villi-like structure [31]. Copyright 2018, Springer Nature. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
