CR1 and Alzheimer disease: A comprehensive analysis of CR1 staining tested a panel of seven mAbs and two antisera from various sources in formalin‐fixed AD and control brain (Fonseca et al., 2016); while most of these reagents did not stain the tissue, two mAbs (8C9.1 and J3B11) from the panel specifically stained astrocytes and specificity was confirmed by pre‐adsorption with sCR1 and staining of isolated astrocytes.