macromolecular crowding
... that macromolecular crowding can make molecules in cells behave in radically different ways than in test-tube enzyme assays?
... that <b id="mwDXc"><a href="./Macromolecular_crowding" id="mwDXg" rel="mw:WikiLink" title="Macromolecular crowding">macromolecular crowding</a></b> <i id="mwDXk">(pictured)</i> can make <a href="./Molecule" id="mwDXo" rel="mw:WikiLink" title="Molecule">molecules</a> in <a href="./Cell_(biology)" id="mwDXs" rel="mw:WikiLink" title="Cell (biology)">cells</a> behave in radically different ways than in <a class="mw-redirect" href="./Test-tube" id="mwDXw" rel="mw:WikiLink" title="Test-tube">test-tube</a> <a href="./Enzyme_assay" id="mwDX0" rel="mw:WikiLink" title="Enzyme assay">enzyme assays</a>?