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(a) Means of trans- and cis-isomers of HCAA products in leaves (n = 4). (b) Representative HPLC-MS/MS profiles of HCAAs. Peaks 1 and 2 correspond to trans- and cis-isomers. The monitored mass transitions (Q1/Q3) were m/z 277.2/147.2 for CouAgm, 307.2/177.2 for FerAgm, 235.2/147.2 for CouPtr, and 265.2/177.2 for FerPtr.
