[1] Univ Calif Irvine, Dept Physiol & Biophys, Irvine, CA 92697 USA
[2] Univ Calif Irvine, Dept Pediat, Div Human Genet, Irvine, CA 92697 USA
[3] Univ Calif Irvine, Dept Microbiol & Mol Genet, Irvine, CA 92697 USA
[4] Univ Calif Lawrence Livermore Natl Lab, Ctr Human Genome, Biol & Biotechnol Res Program, Livermore, CA 94550 USA
[5] Univ Uppsala, Childrens Hosp, Dept Clin Genet, S-75185 Uppsala, Sweden