Abstract：
:Functional studies seem now to confirm, as first suggested by E. Geoffroy Saint-Hilaire in 1822, that there was an inversion of the dorsoventral axis during animal evolution. A conserved system of extracellular signals provides positional information for the allocation of embryonic cells to specific tissue types both in Drosophila and vertebrates; the ventral region of Drosophila is homologous to the dorsal side of the vertebrate. Developmental studies are now revealing some of the characteristics of the ancestral animal that gave rise to the arthropod and mammalian lineages, for which we propose the name Urbilateria.
journal_name
Naturejournal_title
Natureauthors
De Robertis EM,Sasai Ydoi
10.1038/380037a0subject
Has Abstractpub_date
1996-03-07 00:00:00pages
37-40issue
6569eissn
0028-0836issn
1476-4687journal_volume
380pub_type
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