But no screening test can currently reveal which eggs have done the best job of reprogramming adult cells-although several research groups are working to develop such a test for agricultural use.

• 但目前筛选实验还不能显示哪些卵子在对成熟细胞重新编程时做得最为出色－－虽然几个研究小组正在进行这类实验以便在农业上应用。