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" Davis , an expert in this field who is familiar with the new study , adds that this research sheds light on some of the basic processes of the immune system . The Presidents Council for the State Universities of Michigan ( a loose confederation of the public four-year universities in a state with only a handful of small private campuses ) recommends a " core course of study " including English , science , foreign language and social studies , adding up to 19 credits , equal to about a year in college .