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Cross-sections of young leaves of PSE (C. pseudozanguebariae) (I), EUG (C. eugenioides) (II), ARA (C. Arabica “Bourbon”) (III) and CAN (C. canephora) (IV). The advanced linear unmixing process was carried out using chlorophyll, 5-CQA and mangiferin reference spectra. AdE, adaxial epidermis; AbE, abaxial epidermis. Scale bar = 50μm.
