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Particle size distribution and zeta potential spectra of the developed CaP NPs and pDNA-CaP NPs. (a) Particle size distribution of CaP NPs without pDNA loaded, (b) particle size distribution of pDNA-CaP NPs, (c) zeta potential spectrum of CaP NPs without pDNA loaded, and (d) zeta potential spectrum of pDNA-CaP NPs.
