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. 2012 Apr 27;7(4):e35979. doi: 10.1371/journal.pone.0035979

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Bonar et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Femoral sections from P8 (A, B and C) or P13 mice (D) were stained for types I, X (green), II (red) collagen, and counterstained with DAPI (blue). Type II collagen staining was not observed in the acellular structure within the cartilage zone above the hypertrophic chondrocyte zone (hz). Original magnification: ×20 (A and B), ×10 (C and D).