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Soluble isoforms of the epidermal growth factor receptor (sEGFR) previously have been identified in the conditioned culture media (CCM) of the vulvar adenocarcinoma cell line, A431 and within exosomes of the keratinocyte cell line HaCaT. Here, we report that the extracellular domain (ECD) of EGFR is shed from the cell surface of human carcinoma cell lines that express 7×10 5 receptors/cell...