10225
Western blot analysis showed a rapid corresponding increase in p21WAF1 / CIP1 protein , whereas protein levels of another member of the cyclin - dependent kinase inhibitor family , p27kip1 , were unchanged .
 p21WAF1, CIP1, cyclin - dependent kinase inhibitor family, p27kip1
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 p21WAF1, CIP1, cyclin - dependent kinase inhibitor family, p27kip1