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Binding of C-CPE to CLDN. Specific binding of C-CPE-Strep-Tactin Chromeo 488 complex on CLDN expressing cells at cell–cell contact (green); note that C-CPE did not bind onto cells such as MDA-MB-231 that do not express CLDNs. Images were observed under confocal microscopy. Arrows indicate C-CPE binding on cell–cell contact.
