1) The most abundant glycoprotein in the extracellular matrix (ECM) is __________. This protein attaches to __________, which are proteins in the plasma membrane that connect the ECM with the inside of the cell. collagen: dyneins microtubules; integrins microfilaments; dynein collagen; integrins 2) Which listed tissue type would you expect to contain a large proportion of anchoring junctions? root tissue skin brain digestive tract tissue