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(A) The zeta potential of the PCO nanovaccines. (B) The particle size of the PCO nanovaccines. For simplicity, the nanoparticles were abbreviated as: CpG/OVA = CO, PRT/CpG/OVA = PCO. (C) The TEM image of the PCO nanovaccines (scale bar = 100 nm). (D) The stability of the PCO nanovaccines incubated in 10% FBS-containing PBS (pH 7.4) for different time.
