Histone chaperone Spt6 is required for class switch recombination but not somatic hypermutation.
Okazaki IM, Okawa K, Kobayashi M, Yoshikawa K, Kawamoto S, Nagaoka H, Shinkura R, Kitawaki Y, Taniguchi H, Natsume T, et al. Proc Natl Acad Sci U S A. 2011 May 10; 108(19):7920-5. Epub 2011 Apr 25.