这个词是什么意思？
An enzyme that catalyzes the reduction of 6,7-dihydropteridine to 5,6,7,8-tetrahydropteridine in the presence of NADP+. Defects in the enzyme are a cause of PHENYLKETONURIA II. Formerly listed as EC 1.6.99.7.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D004093 · MeSH 2026。
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