Glycocalyx of the brain vasculature. To focus on ECM, note that gap junctions, tight junctions, and regulatory molecules are not shown. Heparan sulfate proteoglycans (HSPGs), Proteoglycans (PGs), Chondroitin sulfate proteoglycans (CSPGs), Endothelial cell (EC), Hyaluronan (HA), Immunoglobulins (Ig), Red blood cells (RBC).