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VE-cadherin (cadherin-5) is an endothelial specific adhesion molecule that is essential for the maintenance of endothelial barrier function and angiogenesis. VE-cadherin is linked to the actin cytoskeleton through a number of adaptor proteins including a-, â-, and ã-catenin. Cytoskeletal dynamics and phosphorylation regulate VE-cadherin mediated cell-cell adhesion. The cytosolic C-terminal Src kinase (Csk) binds via its SH2 domain to the phosphorylated tyrosine 658 site of VE-cadherin. This interaction regulates density dependent cell proliferation. Phosphorylation of tyrosine 658 has also been shown to lead to the uncoupling of p120-catenin from the cytoplasmic tail of VE-cadherin. This phosphorylation event is sufficient to maintain cells in a mesenchymal state during the cell invasion phase of angiogenesis.