TPN

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TPN,

in biochemistry, abbreviation for triphosphopyridine nucleotide, a coenzymecoenzyme
, any one of a group of relatively small organic molecules required for the catalytic function of certain enzymes. A coenzyme may either be attached by covalent bonds to a particular enzyme or exist freely in solution, but in either case it participates intimately in
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 now usually called nicotinamide adenine dinucleotide phosphate, or NADP.
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TPN

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.