Sentence examples for bilateral ancestor from inspiring English sources

The terminal addition theory proposes a pelagic, planktotrophic gastrula and the intercalation theories a benthic, deposit-feeding, possibly bilateral ancestor.

Although the presence of a single LDL-A domain in GPCRs was first observed in mammals, our unpublished study shows that the LDL-A domain repeats in GPCRs exist in protostomes (Molluscs, Arthropods) and in early deuterostomes like echinoderms (Strongylocentratus purpuratus) and Ciona suggesting that the origin of these receptors can be traced back to a common bilateral ancestor.

Previous studies have provided insight into the evolution of the radial body plan of echinoderms from bilateral ancestors based on the development of the adult nervous system in sea urchins (Raff and Popodi 1996; Morris 1999; Sly et al. 2002; Nielsen et al. 2003).

Based on phylogeny and domain architecture analysis we propose that while the signatures for the LDL-A domain and LRR domain containing Rhodopsin subfamily first arose in a bilateral metazoan ancestor, this subfamily has undergone several lineage specific innovations at the level of the combinations and tandem repeats of these domains.

This raises the possibility that the drift duplication have been operating since the common ancestor of bilateral multicellular animals.

Fossil records [ 3], as well as comparative morphology studies [ 4], suggested that the urbilaterian (the last common ancestor of bilateral symmetric animals) may have resembled annelids.

The fact that these two clades each contain protostome (fly, worm) and deuterostome (human, sea urchin) sequences indicates that the functional divergence of α integrins had already occurred in Urbilateria – the common ancestor of bilateral (higher) animals.

It was therefore proposed that a 'prototypic' or 'ancestral' Hox-cluster had evolved from a single Hox-gene via tandem duplication and subsequent divergence [1], [11] and that the common ancestor of all bilateral organisms must have contained a partially differentiated, 'prototypic' Hox-cluster containing approximately six genes [11], [12].

Regarding point 1, molecular genetics now indicates that an ancestral light-sensitive patch may have developed only once, in a very early common ancestor, at least of all bilateral animals, if not earlier.

Our analyses support the view that the ancestor of cnidarians and bilaterians (UrEumetazoa) possessed bilateral symmetry [ 67].

The drift duplication has been producing duplicate copies at paces comparable with tandem duplications since the common ancestor of vertebrates, and it may have already operated in the common ancestor of bilateral animals.