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a) Confocal microscopy images of PLGA-PAA composite microneedles fabricated with a PAA base and DiD-loaded solid PLGA tip (scale bar 200 μm). Confocal microscopy images of microneedles fabricated with varying amounts of DiD-loaded PLGA microparticles as indicated giving a range of PLGA tip sizes (b) and PAA pedestal heights (c).
