Contents

31 March 1989
Vol 243, Issue 4899

About The Cover

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]