GENETIC CONTROL OF CELL INTEGRATION 



319 





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11-76 



and regions which incorporate much thymidine is evident (from Ficq and Pavan, 

 unpublished). 



(fa). The larva was injected with tritiated thymidine seven days before being killed, 

 at a time when puflfing occurs in this region. It is evident that tritium (and therefore 

 presumably DNA) is present throughout the puflF (from Pavan and Sanaia, unpublished). 



