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Kinoshita, K., M. Harigai, S. Fagarasan, M. Muramatsu, and T. Honjo. 2001. A hallmark of active class switch recombination: transcripts directed by I promoters on looped-out circular DNAs. PNAS. 98: 12620-12633.
Nagaoka H., M. Muramatsu, N. Yamamura, K. Kinoshita, and T. Honjo. 2002. Activation-induced deaminase (AID)-directed hypermutation in the immunoglobulin Sµ region: implication of AID involvement in a common step of class switch recombination and somatic hypermutation. J. Exp. Med. 195: 539-534.