- CpG inhibits IgE class switch recombination through suppression of NF kappa B activity, but not through Id2 or Bcl6. Kusunoki, T., Sugai, M., Gonda, H., Nambu, Y., Nagata-Nakajima, N., Katakai, T., Kusunoki, M., Sakamoto, A., Tokuhisa, T., Nakahata, T., Yokota, Y., Shimizu, A. Biochem. Biophys. Res. Commun. (2005)