[1] Univ Minnesota, Dept Lab Med & Pathol, Minneapolis, MN 55455 USA
[2] Univ Minnesota, Dept Orthopaed Surg, Minneapolis, MN 55455 USA
[3] Univ Minnesota, Dept Biochem, Minneapolis, MN 55455 USA
[4] Univ Calif Davis, Dept Biol Chem, Rowe Program Genet, Davis, CA 95616 USA