Fig. 5. In vivo analysis of colocalization of Arnt, CBP and SRC-1 using CFP and YFP chimeric proteins. (A) CFP- and YFP-Arnt localize in discrete nuclear accumulation foci. Cells were transfected with CFP- and YFP-Arnt expression plasmids and analyzed as described in the legend of Fig. 1A. (B) CFP-Arnt colocalizes with YFP-CBP and YFP-SRC-1 but not with YFP-CBP/H3P. Cells were transfected with 400 ng expression plasmids encoding CFP-Arnt and YFP-CBP or YFP-SRC-1 or YFP-CBP/H3P and analyzed as described in Fig. 1A. Bars, 3 µm.