Illinois leaders are making the case that the Chicago area should be home to a new $1 billion federal agency focused on health research. Fifteen members of the state’s congressional delegation and Chicago Mayor Lori Lightfoot are throwing their support behind the effort to locate the Advanced Research Projects Agency for Health in the Chicago area. “Chicago is a natural fit, with a rapidly growing health care and life sciences sector; world-class research universities; and a talented, diverse workforce,” Lightfoot said in a statement Thursday. The agency will focus on accelerating biomedical a…