7671
HLA class I Ags have been implicated to play a major role in this process, since signaling via HLA class I molecules can induce the proliferation of aortic endothelial as well as smooth muscle cells .
 protein: HLA class I molecules; cell type: aortic endothelial; cell type: smooth muscle cells; protein: HLA class I Ags
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: HLA class I molecules, aortic endothelial, smooth muscle cells, HLA class I Ags 
Answer:
 protein: HLA class I molecules; cell type: aortic endothelial; cell type: smooth muscle cells; protein: HLA class I Ags