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Immunofluorescence images presenting key markers of iBMEC microfluidic chip on day 3. (A) Claudin-5, (B) ZO-1, (C) glucose transporter-1 (GLUT1), and (D) P-glycoprotein (P-gp). Nuclei visualized with 4′,6-diamidino-2-phenylindole (DAPI) in blue.
