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Fig. 6. nNOS mRNA expression in peripheral organs of developing zebrafish (at 72
h.p.f.). (AD) (A) Sagittal section, low magnification, demonstrating
nNOS-expressing cell clusters in the posterior portion of the swim bladder
(sb; see transversal section in B), and in the rostral portion of the
alimentary system (putative enteric ganglia shown in C,D). (EG)
Sagittal sections demonstrating how the rostral nNOS-expressing cell clusters
become a population with evenly distributed cells in the mesenchyme along the
alimentary tract and nephritic duct. Brownish structures are pigments. Scale
bars: in A, 100 µm (A,G); in B, 10 µm (BE). sb, swim bladder.