Fig. 5From: Passage of Magnetic Tat-Conjugated Fe3O4@SiO2 Nanoparticles Across In Vitro Blood-Brain Barrier a Images of BBB model at the eighth day; immune-staining of tight joint—ZO-1 for hCMEC monolayer (b) and U251 control (c) at the eighth day; d The permeability of HRP. e TEER measurement on the hCMEC monolayer, U251 monolayer, and PET membrane control. Bar: 50 μmBack to article page