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a) Schematic of PAA/microparticle composite microneedle dissolution and confocal microscopy image of DiD-loaded PLGA microparticles recovered following 5 s exposure of composite microneedles to PBS solution (scale bar 10 μm). b) Schematic of PLGA solid tip microneedle dissolution and confocal microscopy image of DiD-loaded PLGA microneedle tips recovered following 5 s exposure of solid tip microneedles to PBS (scale bar 200 μm).
