The cells of Balb/C untreated and treated with xylem sap and fisetin. A- The cell-fibroblast Balb/c 3T3-A31 untreated. B- Cells treated with fresh xylem sap of H. courbaril at a concentration of 64 μg/mL. C- Cells treated with fisetin 1 at a concentration of 128 μg/mL. Photomicrograph at 200X by inverted microscope.