paracellular
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transcellularcellmembraneepitheliumendotheliumjunctiontight junctiongap junctionadherens junctionpermeabilitydiffusiontransportfluxbarrierleakageintercellularextracellularcytoplasmcytoskeletonproteinclaudinoccludinzonula occludensosmosissoluteionmoleculesecretionabsorptionfiltrationtissuemucosagutintestinekidneyblood brain barriercapillaryvascularinterstitialfluidporechannelselectivitygradienthomeostasispharmacokineticsbioavailabilitydrug deliveryepithelial cellbasolateralapicalluminalpolaritydesmosomecadherinintegrinextracellular matrixbasement membranepermeasetransportereffluxinfluxpassive transportactive transportfacilitated diffusionelectrochemical gradientosmotic pressurehydrostatic pressureendocytosisexocytosistranscytosispermeantsolubilityhydrophilichydrophobiclipophilicmolecular weightleakinesstightness