Identi fi cation and characterization of an oocyte factor required for development of porcine nuclear transfer embryos

Laboratory of Reproductive Biology, Graduate School of Agriculture, Kyoto University, Kitashirakawa, Kyoto 606-8502, Japan; Department of Genetic Development, Kinki University, Kinokawa, Wakayama 649-6493, Japan; Organization of Advanced Science and Technology, Kobe University, Kobe, Hyogo 657-8501, Japan; Faculty of Animal Science and Veterinary, Nong Lam University, Thu Duc District, Ho Chi Minh City, Viet Nam; National Institute of Radiological Sciences, Laboratory of Animal Science Section, Inage-ku, Chiba 263-8555, Japan; Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo, Hokkaido 060-0812, Japan; and Swine and Poultry Research Center, Shizuoka Prefectural Research Institute of Animal Industry, Kikugawa, Shizuoka 439-0037, Japan