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A) Representative images of Safranin O staining of chondrogenic differentiated cells at days 0, 21 and 28. Graph showing the quantification of Safranin O positive cells. Two-way ANOVA with Sidak's multiple comparison test, ** p < 0.002, **** p < 0.0001 B) Phase contrast microscope images (20× objective) of patient's cells at days 0, 21 and 28 of chondrogenic differentiation.
