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(a) Particle size distribution of optimized PAX-RESV PNPs (green line), RESV PNPs (blue line), Placebo (black line) and PAX PNPs (red line); (b) Zeta potential of optimized Placebo (red line), RESV PNPs (green line), PAX PNPs (blue line) and PAX-RESV PNPs (black line).
