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Laboratory of Cell Biology, Division of Biology and Medicine, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720, U.S.A.
A simple and accurate immunocytochemical focus assay is described, whereby both transforming and non-transforming avian retroviruses can be enumerated. After virus infection of chick embryo fibroblasts, an agar overlay is applied; foci of infected cells (expression foci) are detected immunocytochemically after 5 to 7 days. The primary antibodies are monoclonal sera directed against either viral p19gag or pp60v-src. Detection of expression foci after transfection of cells with cloned viral DNA is also demonstrated.
Keywords: avian, retrovirus, immunocytochemistry
Received 10 February 1987;
accepted 13 May 1987.
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