Fig. 1From: Impact of uPA/PAI-1 and disseminated cytokeratin-positive cells in breast cancerImmunocytochemically detected disseminated cells a) Three cytokeratin-positive (CK+) single cells; b) A cluster of 13 cytokeratin-positive cells. Note: These stainings were performed without counter-staining; therefore, the nuclei of the tumor cells are visible only as empty spaces within the cells, which explains different amounts of cytokeratin stainingBack to article page