Fig. 4

Uptake of nanovaccine in fish tissues. a The immunofluorescence images of carp tissues (gill, intestine, kidney, spleen, and liver) after incubated with vaccines (G, MG, SWCNTs-G, and SWCNTs-MG) respectively. b Mean fluorescence intensity of vaccine system in fish tissues. The vaccines were labeled with FITC (green channel); the cell nucleus was labeled with DAPI (blue channel). Data are presented as the mean ± SD. **P < 0.01, *P < 0.05