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Fig. 2. Application of 20 nM RA leads to widespread ectopic otic induction and
to the formation of ectopic otic cells outside of the endogenous ear.
(A) Application of 20 nM RA leads to ectopic pax8 expression
encompassing the entire preplacodal domain (compare with
Fig. 1J,L). (B-D)
Embryos treated with 20 nM RA display ectopic patches of cells that express
the otic marker stm and form enlarged vesicles. (C,D) Higher
magnifications of B show the epithelial structure of these patches. Dorsal
views with anterior towards the top. Scale bar: 35 µm for A; 50 µm for
B; 10 µm for C,D.