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    <rdfs:label xml:lang="en">Glutamine synthetase type I</rdfs:label>
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    <ns1:prib124u1i xml:lang="en">&lt;p&gt;Glutamine synthetase type I (or glutamate-ammonia ligase) has a dodecameric form, which can be subdivided into 1-alpha and 1-beta forms. The phylogeny of the 1-alpha and 1-beta forms appears polyphyletic. &lt;taxon tax_id="562"&gt;Escherichia coli&lt;/taxon&gt;, &lt;taxon tax_id="1148"&gt;Synechocystis sp.&lt;/taxon&gt; (strain PCC 6803), &lt;taxon tax_id="63363"&gt;Aquifex aeolicus&lt;/taxon&gt;, and the crenarcheon &lt;taxon tax_id="2285"&gt;Sulfolobus acidocaldarius&lt;/taxon&gt; have form 1-beta, while &lt;taxon tax_id="1423"&gt;Bacillus subtilis&lt;/taxon&gt;, &lt;taxon tax_id="2336"&gt;Thermotoga maritima&lt;/taxon&gt;, and various euryarchaea has form 1-alpha. The 1-beta dodecamer from the crenarcheon S. acidocaldarius differs from that in E. coli in that it is not regulated by adenylation.&lt;/p&gt;</ns1:prib124u1i>
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