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A549 cell viability and cell morphology of grapefruit seeds’ butanol extract (GSE3n-BuOH) and isolated pure compounds (obacunone (1), limonin (2), nomilin (3), narirutin (4) + naringin (5)). (a) Histograms of MTS cell viability assay. (b) Representative morphological images of untreated cells (Ctrl) and after 24 h from the addition of 0.1 mg/mL of the extracts and pure compounds.
