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            roteins 
            are the curiously-shaped macromolecules cobbled from elaborate chains 
            of amino acids that serve as the basic  | 
         
       
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                | ALS 
                  x-rays yielded a 7.8 angstroms resolution image of the 70S ribosome, 
                  a massively large complex of three RNA and 52 protein molecules 
                  with a total molecular weight of over 2.5 million daltons. (Image 
                  courtesy of the Center for Molecular Biology of RNA, UCSC.) 
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