9818
CDK4 kinase activities were unaffected , as were the levels of the CDK inhibitor p21Cip1 present in cyclin E immunocomplexes .
 CDK4 kinase, CDK, p21Cip1, cyclin E immunocomplexes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 CDK4 kinase, CDK, p21Cip1, cyclin E immunocomplexes