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Treatment of lymphoma B cells with influenza virus. Tumor cells were incubated for 18 hours with inactivated influenza virus. Uptake of viral particles was monitored by detection of (A) viral hemagglutinin by polyclonal rabbit anti-hemagglutinin H1 in B cells treated (bold line) or not (thin line) by virus. (B) Intracellular viral nucleoprotein was detected after permeabilization by acetone and staining with anti-NP, and appears green.
