Table 1. Examination of DNA replication in one-cell stage SCNT embryos by BrdU labeling.

Time after activation	6 hr	9 hr	12 hr	15 hr	18 hr
Total no. of embryos examined	36	71	62	68	33
Total no. (%) of embryos labeled	2 (6)	22 (31)	50 (81)	11 (16)	0 (0)