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The expression of stem cell markers for three kinds of cells. All three stem cell markers, i.e. CD 44, CD 90 and Strol-1, were strongly expressed in MMSCs (a, d, g) and BMSCs (c, f, i) while they were expressed weakly in fibrochondrocytes (b, e, h). Additionally, hematopoietic stem cell marker CD34 and leukocyte marker CD45 were all found to be expressed by none of the three kinds of cells (j–o) (magnification of microscopy: ×20) (Bar 50 μm)
