**6. Conclusion**

 We conclude that even at a low dose of radio waves (20 minutes/day) emitted by mobile phones, the development of chick embryos as seen on the 10th day of incubation would be affected. However, the cells were able to repair the damage by day 15 and no significant difference was observed. At higher dose, the significant different persisted at day 15, and mortality was increased with morphological changes observed. Histological finding in the liver revealed fatty change which was confirmed by ultrastructural findings. The increase of HSP 70 and mRNA in the

exposed groups supported the assumption that RFW exposure has increased ORS which caused damage to the organelles and metabolism in the hepatocytes. These effects question the safety of mobile phones and their potential as a hazard to living cells. It is recommended that mobile phones should be used with caution.
