EXPERIMENTAL and MOLECULAR MEDICINE, Vol. 41, No. 10, 746-756, October 2009 Comparative study of synonymous codon usage variations between the nucleocapsid and spike genes of coronavirus, and C-type lectin domain genes of human and mouse Insung Ahn1*, Byeong-Jin Jeong2,3* and Hyeon Seok Son2,3,4 1Supercomputing Center Korea Institute of Science and Technology Information Daejon 305-806, Korea 2Laboratory of Computational Biology and Bioinformatics Institute of Health and Environment Graduate School of Public Health Seoul National University Seoul 110-799, Korea 3Interdisciplinary Graduate Program in Bioinformatics College of Natural Science Seoul National University Seoul 151-742, Korea 4Corresponding author: Tel, 82-2-740-8864; Fax, 82-2-762-9105; E-mail,