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. 2008 Dec 26;4(12):e1000250. doi: 10.1371/journal.pcbi.1000250

Figure 2. Tibiotarsal morphology and ColX expression patterns.

Figure 2

(A) Avian hindlimb at HH34 stained with Alcian Blue to highlight cartilage, (B–D) ColX expression patterns in sections of the avian tibiotarsus at stages HH30, HH32 and HH34. ColX is expressed in the hypertrophic chondrocytes (white arrowheads) and in the perichondrium/periosteum (black arrowheads). (D) The approximate location of the bone collar is indicated with a green line. (E) ColX expression in HH34 metatarsal rudiments showing bands of expression in the perichondrium (arrows). Up is distal, down is proximal. Scale bars 1 mm.