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(A) Two-photon microscopic images of stomach wall (first row) and the corresponding Z-stack images (second row) at 3 h post-oral injection of FITC-labelled SiMP, PDA MC and micromotors (scale bar = 100 μm). (B) H&E staining of stomach wall at 3 h post-oral injection of SiMP, PDA MC and micromotors. Red arrows indicate micromotors (scale bar = 50 μm).
