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transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy
transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy
transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy
transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy
transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy