1. Department of Biological Sciences, Sungkyunkwan University 300 Chunchundong Suwon 440‐746 Republic of Korea
2. Department of Veterinary Medicine, Kyungpook National University Daegu 702‐701 Republic of Korea
3. Genetics of Development and Disease Branch, NIDDK, National Institutes of Health Bethesda Maryland 20892 USA
4. Cancer Preventive Material Development Research Center, College of Oriental Medicine, Kyung Hee University 1 Hoegi‐dong Dongdaemun‐gu Seoul 130‐701 Republic of Korea
5. Department of Thoracic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, and The Center for Genome Research, Samsung Biomedical Research Institute Ilwon‐dong Seoul 135‐710 Republic of Korea
6. The Center for Genome Research, Samsung Biomedical Research Institute Ilwon‐dong Seoul 135‐710 Republic of Korea
7. Genetics and Development Biology Center, NHLBI, National Institutes of Health Bethesda Maryland 20892 USA