Mobile phone radiation experiment. In 2005 this is the largest ever study of mobile phone radiation on living animals. These rats live inside habitation units built around a radiation antenna (bottom centre). A total of 1500 rats are exposed to radio frequency electromagnetic radiation equivalent to that emitted by mobile phones. At the end of their natural life span (3 years), the rats undergo an autopsy to search for tumours and other diseases. Mobile phones emit a low dose of microwave radiation which can be absorbed through the skull and brain of the user. Photographed at the Cancer Research Centre, Ramazzini Foundation, Bologna, Italy.