HNF3β expression pattern in 4ss
(A–D) and in 20ss (E–H) chicken
embryos. (A and E) In toto
ventral views. (B, C, F,
and G) Transverse sections. HNF3β transcripts are
present in HN-CNH and in the floor plate (FP) and notochord (No)
immediately rostral to HN-CNH. The gene is slightly more strongly
expressed in the vicinity of the endoderm (En), where it is also
expressed. Sagittal sections show the continuity between Hensen’s node
(HN) and FP/No at 4ss (D) and between CNH and FP/No at
20ss (H). NP, neural plate. (Bars = 80 μm.)