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Clinical Chemistry, Vol 6, 572-577, Copyright © 1960 by the American Association for Clinical Chemistry
1 Department of Chemistry, Mount Sinai Hospital, New York.
Measurement of nicotinic acid activity of blood, serum, and urine by means of the ciliate Tetrahymena pyriformis is described. Blood and urine have high activity; serum has little. Narrow specificity and high sensitivity recommend the assay for clinical use.
Submitted on March 30, 1960
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