PASADENA, Calif.--(BUSINESS WIRE)--Arrowhead Research Corporation (NASDAQ:ARWR) announced today that it is scheduled to join the Russell 3000TM Index when the Russell Investment Group reconstitutes its family of U.S. indexes on June 22, 2007, according to a preliminary membership list posted on Monday, June 11, 2007, on www.russell.com. Arrowhead is already a member of the Russell Microcap Index.
