TUCSON, Arizona, April 6 (TNSJou) -- The University of Arizona's Health Science issued the following news release: * * * Biological changes after fire exposure may increase firefighters' disease risk, according to Mel and Enid Zuckerman College of Public Health researchers. * * * A new study led by researchers at the University of Arizona Mel and Enid Zukerman College of Public Health identified changes in the cellular mechanisms controlling gene expression, called epigenetics, that may cont  more