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Top: Motility assay scheme of Bac-MSN in a nutrient-rich collagen 3D gel. Bottom: Microscopy images of a gel edge (left images) with Bac-MSN added at t = 0 h in transmittance A) and fluorescence microscopy B), in which nanoparticles correspond to green dots. Right images show the central area of the same gel at t = 3 h in transmittance C) and fluorescence microscopy D) images.
