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Department of Molecular Biology Hebrew University-Hadassah Medical School, Jerusalem, Israel
Newcastle disease and influenza viruses were purified by centrifuging in sucrose and potassium tartrate gradients and analysed for polyamines by thin-layer chromatography of dansyl derivatives. It has been shown that both viruses contained spermine, spermidine and putrescine in concentrations sufficient to neutralize 30 to 40% of virus RNA phosphates.
accepted 27 November 1973.
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