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Fig. 2. Flow cytometric analysis of GCTM-2 stem cell surface proteoglycan staining in control cells and cells treated for 5 days with 25 ng/ml BMP-2. Left panels show side scatter versus forward scatter; middle panels show histograms of cell counts versus fluorescence intensity of cells stained with isotype matched control; right panels show histograms of cell counts versus fluorescence intensity of cells stained with antibody GCTM-2 against stem cell surface proteoglycan.