# # 4li ^ .# S 4: >' ^ 



15] X-RAY DIFFRACTION OF TMV 273 



of protein, and the resulting structural information will therefore never be 

 as detailed. We cannot hope, in TMV, to find the positions of atoms by 

 X-ray methods. Thus, while some general structural characteristics of the pro- 

 tein of TMV can be determined much more easily than in the simpler struc- 

 tures of crystals of globular proteins, the detailed configuration of the 

 polypeptide chains of globular proteins must be studied in single crystals. 

 It is hoped, however, to find out enough about the structure of the protein 

 (and also of the nucleic acid) of TMV to give some indication of the nature 

 of the nucleoprotein complex in the intact virus. 



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Sps 



