PHOSPHORYLATION IN Clilorella 339 



emptied but only very slowly. It is not a very readily available reservoir. It is 

 comparable in some way to, e.g., starch, which also can be reversed but as a rule 

 only very slowly. One thing that made mo think it might be related to Dr. Krall's 

 substance is his mentioning that it contains sulfur. We may ask whether it has 

 anything to do with sulfur compounds which are now believed to be localis^ed 

 mainly in the beginning of the series. 



References 



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