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Fig. 3. b-catenin localization in gastrula and neurula stages. (A) Sagittal section, stage 12; the large arrow shows the strong labeling in the deep
involuting cells of the dorsal marginal zone. (B) Sagittal section, stage 13; large arrow: dorsal involuting marginal zone; small arrows:
mesoderm-archenteron roof boundary. (C) Detail of the dorsal involuting marginal zone at stage 121/2, before involution (arrowheads) and after
involution (arrows). (D) Detail of the dorsal and ventral blastoporal lips at stage 13; the arrows show the apical staining of the superficial
involuting cells. (E) Transverse section, stage 17; the arrows indicate the mesoderm-endoderm boundary. ar, archenteron roof; bc, bottle cells;
dl, dorsal lip of the blastopore; ec, ectoderm; en, endoderm; lm, lateral mesoderm; no, notochord; nu, neural plate; vl, ventral lip of the
blastopore; yp, yolk plug. Bars = 200 um (A,B,E) and 100 um (C,D). |
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Fig. 5. Parasagittal section of a stage 24 tailbud embryo stained for b-catenin. cg, cement gland; ec, ectoderm; en, endoderm; nu, neuroderm;
pm, posterior mesoderm; so, somites; small arrows, boundary bewteen the presomitic mesoderm and the endoderm; long arrow, boundary
between a newly formed somite and a forming somite undergoing rotation; short arrows, intersomitic boundary between older somites;
arrowhead, increased staining in the inner layer of the ectoderm. Bar, 200 um. |