penetration enhancers
... that penetration enhancers can open tight junctions to allow entry of drugs?
... that <b id="mw0w"><a class="mw-redirect" href="./Penetration_enhancers" id="mw1A" rel="mw:WikiLink" title="Penetration enhancers">penetration enhancers</a></b> can open <a href="./Tight_junction" id="mw1Q" rel="mw:WikiLink" title="Tight junction">tight junctions</a> to allow entry of drugs?