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Immunohistochemistry: CXCR4 staining in 4T1 and MIN-O tumor tissue. A) Distribution of the CXCR4 staining of the different MIN-O tumor stages. B) At a 25x magnification, in 4T1 tumor tissue only cytoplasmatic staining can be seen. In MIN-O tumor tissue, next to cytoplasmatic staining, an increasing level of membranous staining is observed. C) Membranous staining at 40x magnification.
