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Fig. 1. Schematic representation of grafted and scored regions. (A)
Lateral (top) and dorsal (bottom) views of the primitive streak showing the
regions dissected. The rostral end of the node (RN) was recognised by its
wider notochordal plate, and the border (denoted by B) was recognised by the
crown (cr) at the caudal end of the node. (B) Schematic diagrams
showing the position of the CNH (red dashed lines) in sagittal sections (upper
panel; as shown in Fig. 2 and
in Fig. S1 in the supplementary material) and transverse sections (lower
panel; as shown in Figs 5 and
6). Black dotted lines on the
upper panel show the rostrocaudal position of transverse sections. CNH,
chordoneural hinge
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