Staining of the polar distribution of a viral envelope glycoprotein in a midgut columnar epithelial cell. Paraffin sections of the caterpillar, Trichoplusia ni, infected with a baculovirus were immunostained with a monoclonal antibody reactive with the glycoprotein, a peroxidase conjugate and diaminobenzidine as color substrate. See page 1728. [Photomicrograph by B. Andrew Keddie using a Zeiss Axiophot with differential interference contrast optics]

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