1. BIOTEC Yothi-Research Unit, National Center for Genetic Engineering and Biotechnology, 73/1 NSTDA Building, Rama VI Road, Bangkok 10400, Thailand; Department of Animal Sciences, 112 Withycombe Hall, Oregon State University, Corvallis, Oregon 97331-6702; and Faculty of Marine Bioscience and Technology, Kangnung National University, Kangnung, Korea