876
Human class II MHC Ag are a family of cell surface glycoproteins .
 protein: cell surface glycoproteins; protein: Human class II MHC Ag
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: cell surface glycoproteins; protein: Human class II MHC Ag