21.5 Steroid receptors have severalindependent domains Coactivators Basal apparat us Transcription fad or P CAF Figure 21 19 CP日300 Coactivators may have hat 3) activities that Histone tails] acetylate the RNA polym erase, tails of nucleosomal A AC histones a 请莘大Figure 21.19 Coactivators may have HAT activities that acetylate the tails of nucleosomal histones. 21.5 Steroid receptors have several independent domains