. "Reviewed: D'Eustachio, P, 2011-08-23"^^ . "Edited: Jassal, B, 2011-08-17"^^ . "Authored: Jassal, B, 2011-08-17"^^ . "In the second salvage step, dihydrofolate reductase (DHFR) can regenerate BH4 from BH2, a process which increases the BH4:BH2 ratio providing BH4 for coupled eNOS production of NO. In mice cell lines, DHFR inhibition or knockdown diminishes the BH4:BH2 ratio and exacerbates eNOS uncoupling (Crabtree et al. 2009)."^^ . . . . . . "Salvage - BH2 is reduced to BH4 by Dhfr"^^ . "1.5.1.3"^^ . . . . . .