[1] Univ Memphis, Dept Microbiol & Mol Cell Sci, Memphis, TN 38152 USA
[2] St Jude Childrens Res Hosp, Div Expt Hematol, Memphis, TN 38105 USA
[3] Childrens Hosp, Dept Hematol Oncol, Cincinnati, OH 45229 USA
[4] Univ Tennessee, Ctr Hlth Sci, Vasc Biol Ctr Excellence, Memphis, TN 38163 USA