The following primary antibodies were used for this study: mouse monoclonal anti synaptophysin (SP) (clone SVP38, 1.4 ug/ml, Sigma), guinea pig polyclonal anti VGlut11 (1:1000, Millipore), rabbit polyclonal anti postsynaptic density 95 (PSD95, 1 ug/ml, Invitrogen), rat monoclonal anti CD68 (clone FA-11, 1.4 ug/ml, Bio-Rad), rabbit polyclonal anti Iba-1 (1:1000, Wako), rat monoclonal anti C3 (clone 11H9, 0.5ug/ml, Abcam) and rabbit monoclonal anti C1q (clone 27.1, hybridoma supernatant previously described (41 (link), 42 (link))). The specificity of the anti-mouse C1q antibody was demonstrated by the lack of C1q staining detected in the hippocampal CA1-SR of an Arctic C1q conditional KO (ArcC1qaFL/FL :Cx3cr1ERT2) compared with the Arc C1qaFL/FL at super-resolution level (Supp Figure 2) and characterized previously (41 (link)).
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