Shown is an immunocytochemical double-label with an antibody against CD31 (red) and the lectin Ulex europaeus agglutinin-1 (UEA-1, green) of cultured Macaca monkey retinal microvascular cells.  CD31 is localized to endothelial cell membranes, especially at intercellular junctions.  UEA-1 marks all nuclei but preferentially labels the cytoplasm of the single pericyte in the field.    
Yan Qi

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