Abstract
MANY important physiological substances such as some of the hormones, vitamins and metabolic substrates are present in both animals and humans in minute concentration; that is, at levels not detectable by usual physico-chemical procedures. This has necessitated the application of perhaps more sensitive, but usually less specific, biological assays. The results of such assays are often variable from laboratory to laboratory, frequently lack specificity, and usually require special technical skills.
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ROTHENBERG, S. A Radio-enzymatic Assay for Folic Acid. Nature 206, 1154–1156 (1965). https://doi.org/10.1038/2061154a0
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DOI: https://doi.org/10.1038/2061154a0
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