E. L. TATUM 459 



to contribute valuable Information in these fields. Even more important, 

 however, may prove future contributions of research with fungi along 

 a number of lines discussed in this paper. It seems probable that these 

 may lead to a better understanding of the nuclear and cytoplasmic 

 factors involved in enzyme production, specificity, and activity, a 

 problem of fundamental importance in all fields of biology. 



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