A; dilution 0:000); anti claudin-0 (Cat. 00--0000, Invitrogen, Camarillo, CA; dilution 0:0000); anti claudin-0 (Cat. ab00000, Abcam, San Diego, CA; dilution 0:0000); anti claudin-0 (Cat. 00--0000, Invitrogen, Camarillo, CA; dilution 0:000); anti occludin (Cat. 00--0000, Invitrogen, Carlsbad, CA; dilution 0:0000); anti ZO-0 (Cat. 00--0000, Invitrogen, Carlsbad, CA; dilution 0:0000); and anti ZO-0 (Cat. 00--0000, Invitrogen, Carlsbad, CA; dilution 0:000). We also employed mouse monoclonal antibodies anti 