Figure 7: Level of apoptosis by TUNEL assay. 7a-Normal lung section showing the minimal number of apoptotic cells which exist in normal growth cycle. 7b-Lung section of mice injected with B16F-10 cell line (cancer alone) showing a moderated number of apoptotic cells due to enhanced proliferation. 7c- Lung section of treated mice with the essential oil Wedelia chinensis (Osbeck). Shows enhanced apoptotic cells when compared with cancer alone case. [Arrow indicates the dark brown color stained positive apoptotic nuclei].