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Extracellular matrix
In biology, extracellular matrix (ECM) is any material part of a tissue but not part of any cell. Extracellular matrix is the defining feature of connective tissue.
ECM can be made up of proteins such as collagen, fibrin and elastin[?]; minerals such as hydroxyapatite[?]; or fluids such as blood plasma. Given this diversity, it can serve any number of functions.
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