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PLL–OVA nanoparticles did not improve antigen cross presentation effect. Interleukin-2 concentration in supernatant was measured by ELISA when RF33.70 cells were coincubated for 24 hours with dendritic cells harvested at six days. Data are presented as mean ± standard deviation, n = 4, *P < 0.05 versus OVA solution group, **P < 0.01 versus OVA solution group.
Abbreviations: PEI, polyethyleneimine; OVA, ovalbumin; ELISA, enzyme-linked immunosorbent assay.
