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Immunological staining of individual Mycoplasma hyorhinis colonies with a monoclonal antibody to a surface lipoprotein antigenic variant. High-frequency switching in the expression of this component is reflected in the heterogeneous staining and sectoring of colonies representing clonally derived populations of this organism. See page 315. [Photomicrograph by Renate Rosengarten and Kim S. Wise, Department of Molecular Microbiology and Immunology, University of Missouri—Columbia, Columbia, MO 65212]


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Science. ISSN 0036-8075 (print), 1095-9203 (online)