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Fig. 4 | EvoDevo

Fig. 4

From: Cartilage diversification and modularity drove the evolution of the ancestral vertebrate head skeleton

Fig. 4

Expression of barx and irx homologs in larval lamprey. All scale bars are approximately 250μm. (A,B) barxB and barxC homologs are minimally observed throughout all developmental stages of interest. (C) barxA is found in the developing branchial arches as well as the velum and lips. (D) barxA can be identified specifically in the pharyngeal mesoderm in the branchial arches, the upper and lower lip, and the medial flap of the velum. (E) barxA is observed in the upper and lower lips, the ventromedial longitudinal bar, and throughout the non-skeletogenic portion of the branchial arches. (F) irxA can be detected in migratory cells throughout the head and pharynx. (G) irxC is found specifically in the anterior-most portions of the neural ectoderm. (H) irxB is observed throughout the pharyngeal arches as well as portions of the neural ectoderm. (I) irxB is found in the musculature of the pharynx and external velar bar. (J) irxB can be additionally found in the hypobranchial musculature as well as the ventral pharynx. Keywords: hbm: hypobranchial musculature; ll: lower lip; mf: medial flap; pme: pharyngeal mesoderm; pmu: pharyngeal musculature; ul: upper lip; vm: velar musculature; vmlb: ventromedial longitudinal bar; vp: ventral pharynx

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