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Chondrogenic differentiation after 21 day. In chondroinductive culture, the metachromatic nature of the matrix was determined by the toluidine blue staining of glycosaminoglycans as purple stained loci in bone marrow; A) (200×) liver; B) (400×) and adipose tissue; C) (200×) derived MSCs. No stained foci were observed in non induced cell cultures; D) (400×)
