DP family contains at least two members DP1 and 2. Structurally DP1 and 2 are relatively conserved yet their expression appears to be tissue specific. E2F 1 a functional target for the tumor suppressor protein Rb heterodimerizes with DP1 and forms an active E2F transcriptional complex. The interaction between members of the E2F and the DP families is mediated in part by a leucine repeat which is weakly conserved between the two families. Synonym: DRTF1, DRTF 1, DRTF-1, TFDP1, TFDP 1, TFDP-1, Transcription factor Dp-1.