Price, Morgan N <br/><br/>
The histidine operon is ancient.  [electronic resource] 

 -  Journal of molecular evolution  Jun 2006 
 - 807-8 p.  digital 
<br/><br/> Publication Type: Comment; Letter 
<br/><br/><label>ISSN: </label>0022-2844 
<br/><br/><label>Standard No.: </label>10.1007/s00239-005-0191-3  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Histidine--genetics<br/>Operon--genetics<br/>Phylogeny<br/>Proteobacteria--genetics<br/>Time