Fig. 5
Expression of trps1 and tgfβr2 in larval lamprey. All scale bars are approximately 250μm. (A) trps1 can be observed in the pharyngeal arches, neural ectoderm, the otic capsule, and the developing pronephros. (B) trps1 is identified in both the external and internal velar bars, the upper lip and lower lip, and the non-skeletogenic neural crest cells in the pharynx. (C) trps1 is found in similar locations to those seen in stage T27, although expression in the pharynx retreats along the posterior axis. (D) tgfβr2 can be found in the otic capsule, the developing heart, and portions of the upper lip mesenchyme. (E) tgfβr2 is observed in the external velar bar, the pharyngeal mesoderm, the upper and lower lip, the ventrolateral plate, and the hyoid. (F) tgfβr2 is identified in the same locations at T28 as can be found at stage T27, although expression in the ventral pharynx is more visible at this stage. Keywords; evb: external velar bar; he: heart; ivb: internal velar bar; ll: lower lip; NCCs: neural crest cells; oc: otic capsule; pme: pharyngeal mesoderm; pn: pronephros; ul: upper lip; vlp: ventrolateral plate; vp: ventral pharynx