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Content from this document has been transcribed below. Download the original here: Butterly - NIH brochure 1956.pdf (PDF/1 MB)

black and white drawing of the NIH circa 1950.Image Modified
NATIONAL INSTITUTES OF HEALTH

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Division of Biologics Standards

a black and white photograph of a man looking into a microscopeImage Modified

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Scanning tissue culture cells for presence of virus in safety testing of vaccine

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