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Collagen I, collagen II, aggrecan and IHH expression was detected in the temporomandibular joint using immunohistochemistry at (A-D) E14.5, (E-H) E17.5, (I-L) P0 and (M-P) P7 (scale bar, 100 µm). IHH, Indian hedgehog homolog; E, embryonic day; P, post-natal day.
