Matrix (biology)
<p><a href="https://en.wikipedia.org/wiki/Matrix_(biology)">wikipedia</a>:
"In <a href="https://en.wikipedia.org/wiki/Biology" title="Biology">biology</a>, <b>matrix</b> (plural: <b>matrices</b>) is the material (or tissue) in animal or plant <a href="https://en.wikipedia.org/wiki/Cell_(biology)" title="Cell (biology)">cells</a>, in which more specialized structures are embedded, and a specific part of the <a href="https://en.wikipedia.org/wiki/Mitochondrion" title="Mitochondrion">mitochondrion</a>. The internal structure of <a href="https://en.wikipedia.org/wiki/Connective_tissue" title="Connective tissue">connective tissues</a> is an <a href="https://en.wikipedia.org/wiki/Extracellular_matrix" title="Extracellular matrix">extracellular matrix</a>. <a href="https://en.wikipedia.org/wiki/Finger_nail" class="mw-redirect" title="Finger nail">Finger nails</a> and <a href="https://en.wikipedia.org/wiki/Toenail" class="mw-redirect" title="Toenail">toenails</a> grow from matrices. It is found in various <a href="https://en.wikipedia.org/wiki/Connective_tissue" title="Connective tissue">connective tissue</a>. It is generally used as a jelly like structure instead of <a href="https://en.wikipedia.org/wiki/Cytoplasm" title="Cytoplasm">cytoplasm</a> in connective tissue."</p>
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