3973
Inhibition of endogenous Cdk2 by dominant negative Cdk2 attenuated phosphorylation of Thr447 , Thr490 and Thr497 , but had no effect upon Ser581 modification .
 GENE: endogenous Cdk2; GENE: dominant negative Cdk2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: endogenous Cdk2; GENE: dominant negative Cdk2