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Cys-C coexists with Cys-EC in grapevine. Soluble PA extracts from grapevine ('Cabernet Sauvignon') skin and Arabidopsis siliques were analyzed using HPLC-QqQ by multiple reaction monitoring (MRM) in negative mode. The transition of mass to charge ratio (m/z) 408.1 to m/z 125.0 was used for the identification of Cys-C and Cys-EC. The arrows indicate the peaks for Cys-C and Cys-EC standards (sd).
