Department of Animal Biotechnology, UBITA Center for Biotechnology Research (CBRU), Konkuk University, Seoul 143-701, Korea, Department of Bioengineering and Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.|Department of Animal Biotechnology, UBITA Center for Biotechnology Research (CBRU), Konkuk University, Seoul 143-701, Korea, Department of Bioengineering and Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.