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. 2013 Mar 12;162(1):364–378. doi: 10.1104/pp.112.209197

Figure 1.

Figure 1.

Oxalic acid biosynthesis from its biochemical precursors in various organisms. While glycolic, glyoxalic, isocitric, oxaloacetic, and ascorbic acid are the main precursors of oxalic acid synthesis in most organisms, the primary substrate for its synthesis in plants is ascorbic acid.