TABLE 4.

Chromosomal instability in transfected GM10115 cells showing GFP mosaicism^a

Transfectant clone	X-ray dose (Gy)	GFP expression	No. of subclones analyzed	No. of stable subclones	No. of unstable subclonesb
TG9	0	+/−	7	7	0
	1.0	+/−	12	12	0
	2.5	+/−	29	29	0
GH1	0	+/−	27	27	0
	1.0	+/−	36	36	0
	2.5	+/−	47	45	2
GH24	0	+/−	12	12	0
	1.0	+/−	43	43	0
	2.5	+/−	55	55	0

^aTwo hundred metaphase cells from each clone were analyzed.

^bAs defined by at least three unstable arrangements per 200 counted in each subclone.