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Fig. 5. CRB3-induced tight junctions are functional. (A) Transmission electron microscopy analysis of mycCRB3-expressing MCF10A cells. The tight junction is marked with a white arrow and the desmosome is indicated with an asterisk. (B) Measurements of transepithelial electrical resistance (ohms cm2) in mycCRB3-expressing and control MCF10A cells grown for the indicated number of days post confluence. Bar, 100 nm.