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Fibronectin synergized with anti-CD3 antibody to promote CD4 cell proliferation in a serum-free culture system whereas no proliferation was observed when CD4 cells were cultured with anti-CD3 alone or fibronectin alone.
 protein: fibronectin; protein: anti-CD3 antibody; protein: anti-CD3; cell line: CD4 cells; protein: CD4; protein: Fibronectin
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: fibronectin; protein: anti-CD3 antibody; protein: anti-CD3; cell line: CD4 cells; protein: CD4; protein: Fibronectin