| 单词 | NAD | 
| 释义 | NAD   (ĕn′ā-dē) n.  A coenzyme, C21H27N7O14P2, occurring in most living cells and utilized alternately with NADH as an oxidizing or reducing agent in various metabolic processes. [N(ICOTINAMIDE) A(DENINE) D(INUCLEOTIDE).] | 
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