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Fig. 7. Facial ectoderm is a crucial functional source of Edn1 in the
arches. Whole-mount RNA in situ hybridizations at 30 hpf
(A,B,D,E), with immunohistochemistry for
biotin-dextran (brown cells in C,F-I). Dorsal views (A-C),
dorsolateral views (D,E,G-I), 96 hpf flat-mounted Alcian-Blue-stained
cartilages (J,K) combined with immunohistochemistry for
biotin-dextran (L). (A,D) hand2 expression in ventral cranial
NC cells in wild type (arrowheads), which is lost in
suc;edn1-/- (B,E, arrows), except in few cells at
arch borders. (C) Rescue of hand2 in
suc;edn1-/- by unilateral grafting of ectoderm on
the left side (arrow). (F) Transverse cryosection through the arch shows
unilateral rescue of hand2 (arrowhead) in a
suc;edn1-/- embryo adjacent to grafted ectoderm
(brown cells, arrow). The control side did not receive any donor ectoderm and
shows no rescue of hand2 (gray arrow). (G) Another example of
wild-type ectoderm (brown cells, arrow) rescuing hand2 (arrowheads).
(H) Control side of embryo in G. (I) Wild-type endoderm (brown cells, arrow)
did not rescue hand2. (J) Wild-type cartilages include the
mandibular, hyoid and branchial elements including Meckel's cartilage
(arrowhead). (K) Meckel's cartilage is reduced in
suc;edn1-/- (arrow). (L)
suc;edn1-/- mutant that received wild-type
ectoderm shows unilateral rescue of the ventral hyosymplectic cartilage
(arrowhead) adjacent to the grafted ectoderm (arrow, brown cells). h, heart;
nt, neural tube.
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