[1] Univ Calif Davis, Sch Vet Med, Dept Populat Hlth & Reprod, Davis, CA 95616 USA
[2] Univ Autonoma Barcelona, Fac Med, Dept Biol Cellular Fisiol & Immunol, E-08193 Barcelona, Spain
[3] SB Russian Acad Sci, ASG, Inst Cytol & Genet, Novosibirsk 630090, Russia
[4] Univ Munich, Dept Biol 2, D-82152 Martinsried, Germany
[5] Univ Stellenbosch, Dept Bot & Zool, Evolut Genom Grp, ZA-7602 Stellenbosch, South Africa
[6] Otto Von Guericke Univ, Dept Human Genet, D-39120 Magdeburg, Germany
[7] Wellcome Trust Sanger Inst, Cambridge CB10 1SA, England
[8] GSF, Natl Res Ctr Environm & Hlth, Inst Human Genet, D-85764 Neuherberg, Germany