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Baculovirus transduction of mouse intestinal epithelial cells in vivo. One week after the third immunization, intestinal tissue samples were embedded in paraffin and sectioned. Immunohistochemical staining was carried out using a guinea pig anti-HA antibody and rabbit anti-guinea pig FITC. Intestinal villi of mice orally vaccinated with live baculovirus (A), inactivated baculovirus (B), and PBS (C) are shown.
