[1] Univ Calif Los Angeles, Dept Human Genet, Los Angeles, CA USA
[2] Univ Calif Los Angeles, Gonda Ctr, Los Angeles, CA USA
[3] Natl Publ Hlth Inst, Dept Human Mol Genet, Helsinki, Finland
[4] Univ Helsinki, Haartman Inst, Dept Med Genet & Pathol, Helsinki, Finland
[5] Univ Calif San Francisco, Dept Microbiol & Immunol, San Francisco, CA 94143 USA
[6] Univ Calif San Francisco, Canc Res Ctr, San Francisco, CA USA
[7] Univ Oulu, Dept Biochem, Oulu, Finland
[8] Bioctr Oulu, Oulu, Finland