Tricellular junctions play a critical role in regulating epithelial barrier function. In this issue, Cho et al. (2022. J. Cell Biol.https://doi.org/10.1083/jcb.202009037) demonstrate a novel interaction between tricellulin and α-catenin, which connects tricellular junctions to the actomyosin cytoskeleton, thus supporting the epithelial barrier at cell vertices.
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