364 ADVENTURES IN RADIOISOTOPE RESEARCH 



(6) The lower limit of the turnover of kidney phosphatides is not markedly 

 dependent on the age of the rat and amounts to about 5 per cent in the course 

 of 1 hour. Lower and with the age of the rat decreasing values are obtained for the 

 spleen phosphatides. The percentage rate of incorporation of orthophosphate P 

 per hour for a three-month-old rat can be estimated to be about 4. 



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