TABLE 2.

Colocalization of p21 with cyclin B1^a

p21	% of cells with indicated cyclin B staining patternb
	Cyt	CN	Nuc
Present	0	22	6
Absent	38	26	7

^aTo pinpoint the timing of p21 reaccumulation into the nucleus in late stages of the cell cycle, we scored only cyclin B1-positive cells. The data shown are for Hs68 HDF, but similar results were obtained with IMR-90 HDF. 

^bCyclin B1-specific staining patterns (cf. Fig. 1H) were cytoplasmic (Cyt; late S and early G₂ phase), cytoplasmic and nuclear (CN; mid-G₂), and predominantly or exclusively nuclear (Nuc; late G₂ and early stages of prophase).