several lines of evidence have supported the idea that capping protein blocks the barbed end of actin filaments , preventing the addition and loss of monomers [ cooper , j. a. , blum , j. d. , & pollard , t. d. ( 1984 ) j. cell biol . 99 , 217-225 ; isenberg , g. a. , aebi , u. , & pollard , t. d. ( 1980 ) nature ( london ) 288 , 455-459 ] .
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the barbed end of actin filaments
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cell