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Folate breakdown and salvage in plants. Red arrowheads indicate bonds prone to oxidative cleavage. PTAR, pterin aldehyde reductase; GGH, gamma-glutamyl hydrolase; PGH, pABA-Glu hydrolase; HMDHP, 6-hydroxymethyldihydropterin; pABA, para-aminobenzoic acid.
