NETWORK MIXTURE MODELS: AN INTRODUCTION AND APPLICATION TO PROTEIN INTERACTOMES By Elisabetta Marras and Enrico Capobianco IMA Preprint Series # 2230 ( January 2009 ) INSTITUTE FOR MATHEMATICS AND ITS APPLICATIONS UNIVERSITY OF MINNESOTA 400 Lind Hall 207 Church Street S.E. Minneapolis, Minnesota 55455–0436 Phone: 612-624-6066 Fax: 612-626-7370 URL: http://www.ima.umn.edu