Sunlight Oxidation Cigaratte Smoke Pollution Food Cigarette Courtesy of Professor Bevin P. Engelward. Used with permission Smoke Dna damage is sensed G1,G2.& M arrest Signal Transduction KINASES are activated Apoptosis 53 53 Increased DNa repairDNA damage is sensed Sunlight Pollution Oxidation Food Cigarette Smok e Sunlight Pollution Oxidation Food Cigarette Smok e Signal Transduction KINASES are activated p53 p53 P P P G1, G2, & M arrest Apoptosis Increased DNA repair Cigaratte Smoke Courtesy of Professor Bevin P. Engelward. Used with permission