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Binding of virions containing the envelope protein of the SL3-2 MLV to permissive (NIH 3T3) and non-permissive (TE671) cells. The cells were incubated with supernatants from cultures that either did or did not produce viral particles at 4°C and subsequently labeled with anti-envelope antibodies for visualization in a flow-cytometer. (data are representative of several experiments). Light grey: supernatant containing no virions, dark grey: virion containing supernatant.
