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Fig. 7 | Zoological Letters

Fig. 7

From: On the origin of vertebrate somites

Fig. 7

A new evolutionary scenario of the chordate somite formation. a In amphioxus, mesoderm/endoderm boundary formation is organized by Fringe/Delta cassette under Notch signalling. b The Notch signalling-dependent mechanism of segmental boundary formation in (a) was co-opted to the future segments in the anterior PSM of amniotes embryos. The mesoderm is presented in green. The endoderm is in light blue. The dotted line indicates a segmental border

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