Going in the red.  [electronic resource] 

 -  Nature  May 1973 
 - 7 p.  digital 
<br/><br/> Publication Type: News 
<br/><br/><label>ISSN: </label>0028-0836 
<br/><br/><label>Standard No.: </label>10.1038/243007a0  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bacteriorhodopsins<br/>Carotenoids<br/>Rhodopsin<br/>Spectrum Analysis, Raman