Fig. 7.

In vivo uptake of VP1 IBs by mouse PPs. Mice were oral administrated with 50 μg of VP1 IBs or VP1 protein, 12 h later the PPs were collected and subjected to immunohistochemistry (a) or immunofluorescence (b) analysis to detect protein uptake in vivo. The control group was carried out with the same steps, but the anti-VP1 antibody was replaced by PBS. Arrows indicate the VP1 protein or VP1 IBs