however , when an excess of free 60s or 40s subunits , labeled with a different isotope , was added to the cytoplasmic extract before fractionation , the possibility of a small amount of trapping and/or adsorption of free ribosomal particles by the membrane fraction was detected , especially in the case of the 60s subunits ;
C0010834
cytoplasmic
C1179933
free ribosomal