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SDF1 and CXCR4 expression in tumor spheroids. (A) SDF1 expression at the mRNA and protein levels. (B) left- CXCR4 expression by tumor spheroids but not by mesothelioma cells grown in vitro. β-actin is the loading control. right- No CXCR4 expression by mesenchymal stem cells grown in monolayer or by Sca-1-positive cells collected from day 21 lavage. 18S is the loading control.
