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Fig. 7. Xsna expression after neural crest migration in Xenopus. Distribution of Xsna mRNA in tadpoles shown by in situ hybridisation under dark field illumination, with corresponding bright field views below (A-C)or to the right (D,E). Scale bar = 400 pm in 8; 200 pm in A,C-E. A:Stage 39. Ventral horizontal head section. Xsna transcripts in forming
branchial arch cartilages (arrowheads, ba). B: Stage 39. Dorsal horizon-
tal head section. Head mesenchyme (h) labelled. C: Stage 47. Trans-
verse head section. Xsna transcripts in parts of eye (arrowheads, ee) and
head mesenchyme cells (arrows, h). D: Stage 47. Anterior trunk trans-
verse section. Labelling in some sclerotome (arrowheads, s) around neu-
ral tube (nt) and in dorsal aortae walls (arrow, ar). E: Stage 47. Same
anterior trunk transverse section as in (D). Individual labelled cells (ar-
rowheads) in splanchnic gut mesentery (y, probably enteric ganglia) and
in pronephros (pn). a = anterior; ar = dorsal aortae; ba = branchial arch
region; bc = branchial cartilages; ee = eye; ep = epidermis; g = gut: h = head mesenchyme; my = myotome; n = notochord; nt = neural tube;
o = otic vesicle; op = oro-pharyngeal cavity; p = posterior; pn = pronephros; s = sclerotome; y = splanchnic gut mesentery. |
