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Native porcine cartilage in comparison with cell constructs cultured in various environments. Representative images of Safranin O/Fast Green stainings of native porcine cartilage and constructs cultured at 3% or 21% oxygen and 330 or 430 mOsm. The arrows show areas devoid of Safranin O staining indicating a reduced matrix content. The inserts show the cell morphology in their matrix.
