the molecular weight of a dna polymerase ( polymerase c ) purified from the soluble fraction of the cells was estimated to be 142 000 by sedimentation on a sucrose gradient , while the molecular weights of two dna polymerases ( polymerase p-1 and p-2 ) purified from nuclear membrane-chromatin fraction were estimated to be 117 000 and 44 000 , respectively , by the same method .
C0007634
cells
C0008546
chromatin