dna from cells incubated with ( 35s ) -methionine or ( 35s ) -cysteine to radiolabel protein was prepared by three methods : ( solation of nuclei or nucleoids followed by chloroform-isoamyl alcohol ( 24:1 v/v ) extraction and in some cases an additional extraction in the absence or presence of 2m nacl , 40 mm edta or sds ;
C0007634
cells
C0007610
nuclei