p53 represses class switch recombination to IgG2a through its antioxidant function.
Guikema JE, Schrader CE, Brodsky MH, Linehan EK, Richards A, El Falaky N, Li DH, Sluss HK, Szomolanyi-Tsuda E, Stavnezer J. p53 represses class switch recombination to IgG2a through its antioxidant function. J Immunol. 2010 Jun 01; 184(11):6177-87.