Frankincense and sandalwood essential oils-suppressed viability in human bladder cancer J82 cells. (A) Morphological changes of human bladder cancer J82 cells following frankincense (1:1,100 dilution) and sandalwood (1:11,000 dilution) essential oils treatment. Images were taken before and at 24 h following treatments by Olympus IX51 inverted microscope. (B) Cell viability determined by the XTT cell proliferation assay. Results were presented as mean (SD) from 4 independent experiments. *indicates statistical difference between untreated and essential oils-treated J82 cells (P < 0.05).