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            <title xml:lang="en">Radial symmetry, the anterior/posterior axis, and echinoderm Hox genes.</title>
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                <title xml:lang="en">Radial symmetry, the anterior/posterior axis, and echinoderm Hox genes.</title>
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              <p>The strangeness of echinoderm pentaradiality results from superposition of radial symmetry onto ancestral deuterostome bilaterality. The Extraxial- Axial Theory shows that echinoderms also have an anterior/posterior (A/P) axis developed independently and ontogenetically before radiality. The A/P axis is first established via coelomic stacking in the extraxial region, with ensuing development of the pentamerous hydrocoel in the axial region. This is strongly correlated with a variety of gene expression patterns. The echinoid Hox cluster is disordered into two different sets of genes. During embryogenesis, members of the posterior class demonstrate temporal, spatial, and genetic colinearity within the extraxial region.We suggest that displacement of genes from the more anterior Hox classes toward the 5' end of the chromosome leads to control of the later-developing, radially symmetric axial region. Genetic disorder is therefore another way of using colinearity to build the unique echinoderm symmetry.</p>
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