[1] Indiana Univ, Sch Med, Dept Biochem & Mol Biol, Indianapolis, IN 46202 USA
[2] St Jude Childrens Res Hosp, Dept Virol & Mol Biol, Memphis, TN 38105 USA
[3] Indiana Univ, Sch Med, Ctr Canc, Indianapolis, IN 46202 USA
[4] Indiana Univ, Sch Med, Walther Oncol Ctr, Indianapolis, IN 46202 USA