p300/CBP have many non-histone substrates, including the non-histone chromatin proteins HMG1, HMG-N1/HMG14, and HMG-I(Y), the transcriptional activators p53, c-Myb, GATA-1, EKLF, TCF, and HIV Tat, the nuclear receptor coactivators ACTR, SRC-1, and TIF-2, and the general transcription factors TFIIE and TFIIF. Other substrates include the transcription factors Sp1, KLF5, FOXO1, MEF2C, SRY, GATA-4, and HNF-6, HMG-B2, STAT3, the androgen and estrogen (α) receptors, GATA-2, GATA-3, MyoD, E2F(1-3), p73α, retinoblastoma (Rb), NF-κB (p50, p65), Smad7, importin-α, Ku70, YAP1, E1A adenovirus protein, and S-HDAg (hepatitis delta virus small delta antigen). p300/CBP have also been observed to acetylate β-catenin, RIP140, PCNA, the DNA metabolic enzymes flap endonuclease-1, thymine DNA glycosylase, and Werner syndrome DNA helicase, STAT6, Runx1 (AML1), UBF, Beta2/NeuroD, CREB, c-Jun, C/EBPβ, NF-E2, SREBP, IRF2, Sp3, YY1, KLF13, EVI1, BCL6, HNF-4, ER81 and FOXO4 (AFX).