220 P. P. Slonimski and H. de Robichon-Szulmajster 



Table VI 



Substances found inactive as antimutagens 

 ("Petite" induction by 1 to 1-5 xlQ-e m Euflavine) 



(h) The amount of euflavine fixed by the cells in the presence 

 or in the absence of adenine is practically the same. It can be 

 measured spectrophotometrically after extraction by HCl- 

 ethanol. To explain the suppression of mutation the amount 

 fixed should have been more than halved. 



(c) The euflavine spectrum does not change upon addition of 

 adenine, while a definite change is observed upon addition of 

 adenine deoxyribonucleotide or nucleic acid (Peacocke and 

 Skerrett, 1955). 



