Abstract
AMV yields four species of RNA when treated with Sodium-dodecylsulfate. In sucrose gradient centrifugation, they sediment with 62, ~45, 30 and 4 —10 S respectively. The 62 S fraction contains the viral RNA proper in a relatively pure state. In the other fractions — containing some protein — host cell RNA is detected by isotopic labelling. These findings are discussed in particular with respect to results on chicken-leucosis-viruses by other authors.

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