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Tissue retention of PEDOT/Zn micromotors. (a–d) Microscopic images illustrate the retained micromotors on the stomach tissues collected at (a) 2 h, (b) 6 h, and (c) 12 h post-oral administration of PEDOT/Zn micromotors and (d) 2 h post-oral administration of PEDOT/Pt micromotors (serving as a negative control). Scale bars, 100 μm. (e) Enumeration of the density of PEDOT/Zn and PEDOT/Pt micromotors retained on the stomach tissues at the different times after the administration.
