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A microbiologic method based on Lactobacillus casei for assaying folic acid activity in serum is presented. The assay correlates directly with the clinical diagnosis. Comparison with formimino-L-glutamic acid determinations and other microbiologic assay methods shows the assay here described to yield a more dependable estimate of the folic acid status in humans.
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Baker et al. (1959) studied this question.
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