Figure 5.

The ability of waterpipe smoke (flavored and unflavored) to induce apoptosis in heart ventricular tissue. A: positive control, with the presence of many dark-brown apoptotic nuclei. Arrows indicate one apoptotic nucleus (TUNEL). B: heart ventricular tissue of air-exposed rat, no dark-brown apoptotic nuclei. C: heart ventricular tissue of flavored waterpipe exposed rat, no dark-brown apoptotic nuclei. D: heart ventricular tissue of unflavored waterpipe exposed rat, no dark-brown apoptotic nuclei