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HPLC analysis of the changes in the flavonoid expression in the flower petals of three cultivars during flower development. HPLC analysis of three crabapple cultivars in the present study. The compositions identified in the HPLC analysis are divided into four types: anthocyanin, flavone, flavanol, and flavonol, shown in four colors in the legends. The numbers 1–5 refer to five flower development stages.
