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Fig. 6. The ciliary funnel expresses orthologs of placode-marking genes. Left
lateral (A) and dorsal (C) views of early hatchlings shows that the roof of
the pharynx expresses six3/6a. six3/6a is also expressed in the
anterior brain, rostral towards the sensory vesicle. Left lateral (B) and
dorsal (D) views of the same stage as in A,C show that six3/6b is
expressed in a more limited domain in the right side of the pharynx roof in
just three cells. When the ciliary funnel can be easily seen as a projection
to the right of the brain in late hatchlings, six3/6a (E) and
six3/6b (F) are both expressed in the funnel walls. In dorsal (G) and
lateral (H) views of late hatchlings, pitx expression can be seen in
both the dorsal and ventral walls of the pharynx (ph), as well as in the
ventral-most part of the funnel wall where it meets the pharynx. br, brain
expression; cf, ciliary funnel; ep, epidermal expression; lb, bristle-bearing
lip cell; mo, mouth; ph, pharynx. Scale bars: 10 µm.
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