These proteins contain a conserved basic DNA binding domain that binds the E box DNA motif.[2] They dimerize with other HLH containing proteins through an HLH-HLH interaction.[3]
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^Barndt R, Zhuang Y (1999). "Controlling lymphopoiesis with a combinatorial E-protein code". Cold Spring Harb Symp Quant Biol. 64: 45–50. doi:10.1101/sqb.1999.64.45. PMID11232321.