The following antibodies were used in a 1:1000 dilution: p35 (C-19, Santa Cruz, polyclonal), GFP (polyclonal, Molecular probes), NMDA receptor 2A (MAB5216, Chemicon), synaptophysin (SVP-38, monoclonal), actin (polyclonal), and GFAP (polyclonal) were from Sigma. Phospho-NR2A (1:500), phospho-PSD-95 (1:5), and phospho-PAK (1:1000) antibodies were gifts from Dr. You-Ming Lu, Dr. Maria Morabito, and Dr. Magareta Nikolic, respectively.