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Fig. 2. XHoxa2 developmental expression pattern. (A,B) Lateral and dorsal view of a stage 26 embryo showing XHoxa2 expression in branchial arches and hindbrain up to the r1/r2 boundary (arrow). (C,D) Lateral view and horizontal section, respectively (broken line in C represents level of section in D), of stage 28 embryos showing higher XHoxa2 transcript levels in PA2 (arrows) than more posterior arches (C), as well as a specific distribution in NC cells (D).
(E,G) Coronal and horizontal sections, respectively, of stage 41 embryos showing XHoxa2 expression in the procartilaginous condensation of the ceratohyal (arrow), which is identified at stage 44 by Alcian Blue/Sefranine O staining (F,H). BH, basihyal; C, ceratohyal; CG, cement gland; E, eye; Et, ethmoid; G, gill; Ih, interhyoideus; NT, neural tube; Oh, orbitohyoideus; PA, pharyngeal arch; Q, palatoquadrate; r, rhombomere. |
