to determine whether there was a surface igm- b cell in the tl which could manifest such responses , we compared the frequency of cells expressing the b cell-specific phenotypic marker cd20 ( b1+ ) , surface igm ( sigm+ ) , surface igg ( sigg+ ) , and surface igd ( sigd+ ) in tl and autologous blood mononuclear cells in 36 myasthenic patients .
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the
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blood mononuclear cells