Sepiapterin reductase (SPR) (Ichinose et al. 1991) reduces DHNTP to tetrahydrobiopterin (BH4).
Ichinose, H, Nagatsu, T, Katoh, S, Fujita, K, Sueoka, T, Titani, K
sepiapterin reductase activity of p-SPR dimer [cytosol]
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