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. 2015 Aug 24;5:13438. doi: 10.1038/srep13438

Figure 4. The chromatogram of OAs detected by HPLC.

Figure 4

(a) The standard compounds: 1, oxalic acid; 2, malic acid; 3, citric acid; 4, succinic acid; 5, fumaric acid. (b) Root exudates of banana.