Homologous elements hs3a and hs3b in the 3' regulatory region of the murine immunoglobulin heavy chain (Igh) locus are both dispensable for class-switch recombination.
Yan Y, Pieretti J, Ju Z, Wei S, Christin JR, Bah F, Birshtein BK, Eckhardt LA. Homologous elements hs3a and hs3b in the 3' regulatory region of the murine immunoglobulin heavy chain (Igh) locus are both dispensable for class-switch recombination. J Biol Chem. 2011 Aug 05; 286(31):27123-31.