Institution: | 1. Subtropical Animal Experiment Station, National Institute of Animal Science, RDA, Jeju, 690-150, Korea 2. Educational Science Research Institute, Jeju National University, Jeju, 690-756, Korea 3. National Institute of Animal Science, RDA, Suwon, 441-350, Korea 4. Department of Science Education, Cheju National University, Jeju, 690-756, Korea
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