Fig. 4.
Nuclear (nuc) or cytosolic (cyto) protein extracts and probes for the C/EBPβ 3′UTR region were used in binding experiments, UV-crosslinked and digested with RNase as detailed in Methods. The samples were analyzed for molecular size by SDS-PAGE. Molecular weights of the crosslinked proteins in lanes 7 and 8 were based on the mobility of protein standards.