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1 ． Martin F and Kearney JF ． B1cells：similarities and differences with other B cell subsets ． Cur Opin I mmunol 2001，13 ∶ 195‐201.5 ． Wu HJ ． Positive and negative roles of CD72in B cell function ． I mmunol Res2002，25 ∶ 155‐166. ......