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Example sentences for: bilaterians

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(2) The primitive condition in bilaterians is most likely a single Runx gene, represented in the deuterostomes of our collection by the sea urchin S. purpuratus and the tunicate C. intestinalis , and in the protostomes of our collection by C. elegans . Runx gene duplications appear to have occurred independently in the lineages leading to vertebrates (which have at least three Runx genes) and insects (which have three or four Runx genes), suggesting that Runx genes in these latter organisms have probably acquired a number of specialized, taxon-specific regulatory functions (e.g.
(1) In the public databases, the Runt domain is currently found only in sequences from bilaterians.
, [1]) suggest that sexual dimorphism was likely a feature of the last common ancestor of the coelomate bilaterians, a vast clade of animals that excludes only sponges, ctenophores, cnidarians, and acoel flatworms.
The same is apparently true for the single sea urchin gene (although this is provisionally based on the fragmentary evidence of a single small BAC clone [ 10 ] ), suggesting that a single exon downstream of the Runt domain may be the primitive condition for bilaterians.
The simplest explanation of such a gene distribution is that possession of a single Runx gene is the primitive condition for bilaterians, i.e., that the multiplicity of Runx genes in the vertebrate and arthropod lineages resulted from independent gene duplications within those respective lineages.