Seung Kyu Choi [ School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea. ]
Sun uk Kim [ School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea. ]
Na Na Cho [ School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea. ]
Chang Sik Park [ Division of Animal Science & Resources, Research Center for Transgenic Cloned Pigs, Chungnam National University , Daejeon 305-764, Korea. ]
Sang Ho Lee [ School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea. ]