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(A) PCA score plot from Rauwolfia species showing discrimination among the R. hookeri, R. micrantha, R. serpentina, R. tetraphylla, R. verticillata and R. vomitoria. (B) Loading plot of the normalized LC–MS data obtained from three samples of each species showing possible ions of interest including those predominantly responsible for the discrimination of R. hookeri, R. micrantha, R. serpentina, R. tetraphylla, R. verticillata and R. vomitoria.
