Table 1. Transplantation of wild-type pole cells (expressing lacZ) to the dorsal mesoderm of oskar embryos.

Age of recipient embryos	Injected embryos, n	Hatched embryos, n (%)	Emerged adults, n (%)	Fertile adults, n (% of emerged adults)	Tumorous ovaries,*n (% of ovaries with tumors)
Stage 11	228	157 (68.9)	42 (18.4)	23/37 (62.2)	9/13 (69.2)
Stages 11-12	96	72 (75)	18 (18.8)	6/11 (54.5)	2/4 (50)
Stages 12-13	141	111 (78.7)	33 (23.4)	16/29 (55.2)	6/10 (60)

^*The tumorous ovaries occur when male pole cells are transplanted into female embryos (14).