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Nuclear localization of pERK in hippocampal neurons induced by E2 or P4, but not MPA. pERK (green; FITC) immunofluorescence and DAPI nuclear counterstain (blue) in primary hippocampal neurons treated with vehicle (C, Top Left), E2 (Right), P4 (PRG, Middle), and MPA (Bottom). (Bar, 10 μm.)
