Immunohistochemical detection of eGFP. Rabbit anti-eGFP antibody was used to detect eGFP 30 days after intravascular injection of eGFP lentivirus into a normal MF1 mouse fetus at 16 days of gestation. Strong staining was observed mainly in hepatocytes (left) and cardiac tissue (right). Scale bar is 200 μm. A high magnification of staining in cardiac myocytes is shown in the inset.