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Detection of lettucenin A in leaf and root extracts of lettuce (cv. Tizian), using (A) thin-layer chromatography: yellow fluorescent lettucenin spots after elicitation of lettuce leaves with CuSO4 (left) and AgNO3 (right). (B) Identification of lettucenin A in leaf and root extracts of lettuce by comparison of retention times and spectral characteristics using RP-HPLC-UV/VIS and (C) by UHPLC orbitrap-MS.
