SUMMARY 



of appropriate recognition units, could probably be restated 

 so as to cover the facts but a complicated and clumsy formu- 

 lation would be required. Jerne's natural selection theory in 

 its original form rather fails to provide any point of contact 

 with the problems of this field. 



Perhaps one of the most attractive aspects of the clonal 

 selection hypothesis is the way in which it allows immuno- 

 logical anomalies to be superimposed on malignant or pre- 

 malignant processes. Cancer also is a clonal selection process. 



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