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Assessment of protein expression in circulating tumor cells (CTCs). Vimentin (A) and epidermal growth factor receptor (EGFR) (B) expressions were assessed by On‐chip Sort during sorting. Intensity of fluorescent‐labeled protein expression on CTCs was analyzed by FlowJo software 7.6.5. Cell images of EGFR expression on CTCs are embedded in (B). PE, phycoerythrin
