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Safranin O/Fast Green staining of non-osteoarthritic (non-OA) human articular chondrocytes growing on a hydrogel (A–C) or in pellet culture (D–F). (A+D) Passage 2; (B+E) Passage 3; (C+F) Passage 4. Scale bars: 50 µm (A–F), 100 µm (D–F, inserts).
