Fig. 2
Expression of prg4 and col9a1 in larval lamprey. All scale bars are approximately 250μm. (A,B) prg4 is detected in the ventral aorta, but no activity outside of this tissue is observed. (C) col9a1 is found in the ventral pharynx, otic capsule, and the notochord. (D) At stage T27, we observe col9a1 in the oral hood, dorsal and ventral edges of the branchial arches, the hyoid, ventromedial longitudinal bar, and the endostilic cartilage. (E) col9a1 is visualized throughout the branchial arches, the ventromedial longitudinal bar, the endostilic cartilage, the hyoid, the internal velar bar, the nasal capsule, and the oral papillae. Keywords: ba: branchial arches; ec: endostilic cartilage; hy: hyoid; ivb: internal velar bar; nc: nasal capsule; nt: notochord; oc: otic capsule; oh: oral hood; op: oral papilla, va: ventral aorta; vmlb: ventromedial longitudinal bar; vp: ventral pharynx