[1] Ohio State Univ, Dept Obstet & Gynaecol, Lab Perinatal Res, Columbus, OH 43210 USA
[2] Univ So Denmark, Inst Mol Med, Odense, Denmark
[3] Univ London Royal Vet Coll, Dept Vet Basic Sci, London, England
[4] Univ Wisconsin, Dept Comparat Biosci, Madison, WI 53706 USA
[5] Univ Munich, Dept Obstet & Gynaecol, Munich, Germany
[6] Yamaguchi Univ, Fac Agr, Lab Vet Anat, Yamaguchi 753, Japan
[7] Univ Calif San Diego, Dept Reprod Med, La Jolla, CA 92093 USA
[8] Univ Calif San Diego, Dept Pathol, La Jolla, CA 92093 USA
[9] Univ Missouri, Div Anim Sci, Columbia, MO USA
[10] Ohio State Univ, Dept Physiol & Cell Biol, Columbus, OH 43210 USA
[11] Univ Illinois, Chicago, IL USA
[12] Saitama Med Sch, Saitama, Japan
[13] Nippon Med Sch, Dept Mol Med & Anat, Tokyo 113, Japan
[14] Univ Tokyo, Grad Sch Sci, Dept Biophys & Biochem, Tokyo 113, Japan
[15] Newcastle Univ, Inst Cellular Med, Newcastle Upon Tyne NE2 4HH, Tyne, England