7674
Signaling through HLA class I molecules induced cyclin E -associated kinase activity within 4 h in quiescent endothelial cells , and appeared to mediate the inactivation of Rb .
 cell type: quiescent endothelial cells; protein: HLA class I molecules; DNA: cyclin E; protein: Rb
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: quiescent endothelial cells, HLA class I molecules, cyclin E, Rb 
Answer:
 cell type: quiescent endothelial cells; protein: HLA class I molecules; DNA: cyclin E; protein: Rb