Within a cell or cells.
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in·tra·cel·lu·lar -'sel-yə-lər adj existing, occurring, or functioning within a cell <\intracellular enzymes> <\intracellular localization of RNA synthesis> <\intracellular parasites>
in·tra·cel·lu·lar·ly adv
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adj.
situated or occurring inside a cell or cells.
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in·tra·cel·lu·lar (in″trə-selґu-lər) within a cell.Medical dictionary. 2011.