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(a) Confocal microscopy images of PLGA-PAA composite microneedles fabricated to encapsulate DiD-loaded PLGA microparticles (MP) (right, scale bar 200 μm). SEM images of (b) resulting microparticle-encapsulating microneedle array (scale bar 200 μm) and (c) high magnification image of the composite needle interior of a fractured microneedle (scale bar 10 μm). Reprinted with permission from Reference 64.
