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qPLM images of porcine femoral trochlea cartilage at 4 months maturation (A) and 21 months maturation (B). A classic “Benninghoff” type architecture with a thick radial zone and thin superficial zone is only observed in the older animal. At 4 months the whole cartilage thickness is dominated by a superficial zone. Reproduced from Rieppo et al. (10) with permission. qPLM, quantitative polarized light microscopy.
