851
Heterogeneity of antigen molecules recognized by anti-tax1 monoclonal antibody Lt-4 in cell lines bearing human T cell leukemia virus type I and related retroviruses .
 protein: antigen molecules; protein: anti-tax1 monoclonal antibody; protein: Lt-4
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: antigen molecules; protein: anti-tax1 monoclonal antibody; protein: Lt-4