John Marchalonis, whose research helped create the fields of autoimmunity and immune system evolution, died of cancer on June 22. He was 66.During his career, 20 years of which was spent at the University of Arizona in Tucson, Marchalonis published studies on topics ranging from mechanisms of human autoimmune disease to the evolution of the immune system in sharks and other vertebrates. He wrote eight books and published more than 370 articles. "Jack was an extraordinary man in many ways," said Samuel Schluter, also from the University of Arizona, who collaborated with Marchalonis for 20 years. "He was close to being a genius. He would always come up with ideas. It's going to be a challenge to continue with the science because we're going to miss his ideas." Marchalonis was also known for supporting a colleague in his department who reported abuse of funds at the University of Arizona,...

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