Fig. 2
From: Development of hypobranchial muscles with special reference to the evolution of the vertebrate neck
Gene expression analysis of HBM precursors in chicken and mouse embryos. Pax3, Dlx5 and Myf5 expression patterns in chicken HH20 (a) and HH23 (b), and mouse E10.25 (c) and E10.5 (d). Two-color in situ hybridization with Pax3 (red) and Dlx5 (blue) probes in chicken HH23 (e) and mouse E10.5 (f). Lateral views. Arrowheads indicate HBM precursors. Note that HBM precursors, marked by Pax3 and Myf5 expressions, developed medially at the level of hyoid arch at stage HH23 and E10.5 embryos. AER, apical ectodermal ridge; ba1, first branchial arch mesoderm; dm, dermomyotome; do, dorsal oblique; eb1, ectomesenchyme of first branchial arch; ed., endolymphatic duct; eh, ectomesenchyme of hyoid arch; ep, ectomesenchyme of pharyngeal arches; fm, forelimb muscles; ha, hyoid arch mesoderm; hc, hypoglossal cord; lr, lateral rectus; mr, medial rectus; my, myotome; ne, nasal epithelium; np, nasal prominence; nt, neural tube; ot, otic vesicle; pcm, pericardial mesoderm; sp., subpallium; V, trigeminal ganglion; vo, ventral oblique. Scale bars, 200Â ÎĽm