Figure 2

Electron microscopic photographs of human embryonic spinal cord tissue treated with the Prv for 12 h. In A, the green fluorescent protein immunohistochemistry end-product is labelled by silver granules. The boxed area at high magnification reveals the reaction product in the cytoplasm. In B, the virion antigens are visualized in the infected human embryonic spinal cord cells. The boxed area shows at high magnification the presence of the virion antigen on the cell membrane.