Outcrossed cottonseed and adventitious Bt plants in Arizona refuges Shannon Heuberger, Christine Yafuso, Gloria Degrandi-Hoffman, Bruce E. Tabashnik, Yves Carrière and Timothy J. Dennehy Environ. Biosafety Res., 7 2 (2008) 87-96 Published online: 16 April 2008 DOI: 10.1051/ebr:2008005