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Fig. 7. Paired ciliated sensory organs of the lips and posterior trunk express Eya
and Six genes. (A) Bilaterally paired patches of eya expression in a
tailbud stage embryo at the border between the posterior trunk and tail where
the Langerhans receptors develop. (B) Optical section at dashed plane shown in
A. (C) Unilateral, right side incipient tailbud expression of six3/6a
precedes later bilateral expression. (D) eya expression continues in
paired patches into early hatchling stages (ventral view). (E)
six3/6a expression becomes bilateral in the Langerhans primordia by
early hatchling stages. (F) A living, late hatchling with fully formed
Langerhans receptors (la) bulging from the posterior trunk near the tail. (G)
Scanning electron micrograph (SEM) of one Langerhans receptor. (H)
six1/2 expression in a late hatchling narrows to the lips (li) where
rows of ciliated receptors form. (I) SEM of an adult mouth showing the rows of
sensory cilia (inset) emerging from a groove made up of epithelial cells that
nearly cover the innervated receptor cells of the lower lip and inner
stomodeum roof. a, anterior; br, brain; cg, caudal ganglion; en, endoderm; l,
left; la, Langerhans receptor; li, lips; no, notochord; p, posterior; r,
right; st, stomach; vo, ventral organ. Red asterisks in A-E indicate
Langerhans primordium. Scale bars: 20 µm in A-F,H; 5 µm in G,I.
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