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Gene amplification of the chromosome 11q13 in breast cancer and squamous carcinomas in the head and neck results in frequent overexpression of cortactin, a prominent substrate of Src-related tyrosine kinases in the cell cortical areas. To investigate the role of cortactin in tumor progression, we analyzed MDA-MB-231 breast cancer cells overexpressing green fluorescent protein-tagged murine cortactin (GFP-cortactin) and a cortactin mutant deficient in tyrosine phosphorylation under the controlpmid:11559568 fatcat:62lr3s764vfidjpntjzm7wxkku