mouse lymphoma cells , l5178y , were labeled for 20 min with 3h-uridine , and the isolated nuclei were incubated in a medium consisting of 0.25 m sucrose , 10 mm tris-hcl ( ph 7.5 ) , 2 mm cacl2 , 1 mm atp and 1mm pmsf .
C0007634
cells
C0007610
nuclei