Basal levels of GluA1 phosphorylation at S845 are reduced in hippocampal slices from GluN2AΔC/ΔC mice. Basal levels of GluA1 phosphorylation at T840 (A), S845 (B), and S831 (C) in hippocampal slices from wild-type (open bars, n = 5 in A and B, n = 3 in C) and GluN2AΔC/ΔC mice (filled bars, n = 7 in A and B, n = 3 in C). Total GluA1 levels (D) in GluN2AΔC/ΔC slices (n = 7) are not different from wild type (n = 5).