OUTLINE 1. Conservative Site-Specific Recombination 2. Biological Roles of Site-Specific Recombinatⅰon 3. Transposition 4. Examples of Transposable Elements and Their Regulation 5. VD)J RecombinationOUTLINE 1. Conservative Site-Specific Recombination 2. Biological Roles of Site-Specific Recombination 3. Transposition 4. Examples of Transposable Elements and Their Regulation 5. V(D)J Recombination