Conversation so far:
where is the glycocalyx located in the cell
The glycocalyx is located on the apical surface of endothelial cells.
what is the glycocalyx made out of
The glycocalyx is composed of a negatively charged network of proteoglycans, glycoproteins, and glycolipids.
what does the glycocalyx do
The glycocalyx is a type of identifier that the body uses to distinguish between its own healthy cells and transplanted tissues, diseased cells, or invading organisms.

Question: what is an example of the matrix in nature
Self-contained rewrite: what is an example of  glycocalyx in nature