7676
Furthermore, there was no increase in cyclin D-associated kinase activity upon HLA class I ligation , suggesting that cyclin E-dependent kinase activity mediates Rb inactivation, leading to E2F activation and cell proliferation .
 cyclin D-associated kinase, cyclin E-dependent kinase, HLA class I, E2F, Rb
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 cyclin D-associated kinase, cyclin E-dependent kinase, HLA class I, E2F, Rb