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To compare the role of CD28 , neonatal and adult T cells were stimulated with a pair of mitogenic anti-CD2 antibodies in the presence or absence of anti- CD28 MoAb .
 protein: CD28; protein: CD28; cell type: T cells; cell type: adult T cells; cell type: neonatal; protein: anti- CD28 MoAb; protein: mitogenic anti-CD2 antibodies
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: CD28; protein: CD28; cell type: T cells; cell type: adult T cells; cell type: neonatal; protein: anti- CD28 MoAb; protein: mitogenic anti-CD2 antibodies