Definition: 2-, 3-, or 4-Pyridinecarboxylic acids. Pyridine derivatives substituted with a carboxy group at the 2-, 3-, or 4-position. The 3-carboxy derivative (NIACIN) is active as a vitamin.
/defic: consider also PELLAGRA; /ther use: coordinate disease with /drug ther, not /diet ther
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