CONSTITUENTS OF ELEMENTARY BODIES OF VACCINIA : IV. DEMONSTRATION OF COPPER IN THE PURIFIED VIRUS.

J Exp Med · 1941 · PMC2135168 · PMID 19871116

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highly significantno p-value reported

The absence of iron and other metallic constituents of tissue from the purified virus is highly significant in view of the original source of the virus, from animal skin.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.