dl-Methoxinine and dl-ethionine prevent the propagation of influenza PR8 virus in a medium ordinarily favorable.

The inhibitors do not act by destroying the virus, the host tissue, or by preventing the infection of the cells, but by interfering with the synthesis of the virus.

The action of the inhibitors can be blocked by l-methionine.

l-Methionine is involved in the biosynthesis of influenza PR8 virus.

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