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In other words, the extracellular matrix largely determines how a tissue looks and functions. The extracellular matrix is made up of proteoglycans, water, minerals, and fibrous proteins. A proteoglycan is composed of a protein core surrounded by long chains of starch-like molecules called glycosaminoglycans.
In no tissue is the extracellular matrix so well defined-or so easily studied-as in connective tissue, where the extracellular matrix is frequently more plentiful than the cells. Found throughout your body, connective tissue serves as the scaffolding for all other tissues.