▁activ ating ▁the ▁recip ient ▁egg ▁was ▁also ▁far ▁from ▁understood . ▁However , ▁by ▁ 2 0 1 4 , ▁research ers ▁were ▁reporting ▁success ▁rates ▁of ▁ 7 0 - 8 0 % ▁with ▁cl oning ▁p igs ▁and ▁in ▁ 2 0 1 6 ▁a ▁Korean ▁company , ▁So o am ▁Bi ote ch , ▁was ▁reported ▁to ▁be ▁producing ▁ 5 0 0 ▁cl oned ▁emb ry os ▁a ▁day . ▁ ▁In ▁SC NT , ▁not ▁all ▁of ▁the ▁don or ▁cell ' s ▁gen etic ▁information ▁is ▁transferred , ▁as ▁the ▁don or ▁cell ' s ▁mit och ond ria ▁that ▁contain ▁their ▁own ▁mit och ond rial ▁DNA ▁are ▁left ▁behind . ▁The ▁resulting ▁hy brid ▁cells ▁retain ▁those ▁mit och ond rial ▁structures ▁which ▁originally ▁belonged ▁to ▁the ▁egg . ▁As ▁a ▁consequence , ▁cl ones ▁such ▁as ▁Dol ly ▁that ▁are ▁born ▁from ▁SC NT ▁are ▁not ▁perfect ▁copies ▁of ▁the ▁don or ▁of ▁the ▁nucle us . ▁This ▁fact ▁may ▁also ▁ham per ▁the ▁potential ▁benefits ▁of ▁SC NT - der ived ▁t issues ▁and ▁org ans ▁for ▁ther apy , ▁as ▁there ▁may ▁be ▁an ▁imm un ores ponse ▁to ▁the ▁non - self ▁m t D NA ▁after ▁trans plant . ▁ ▁Cont ro vers y ▁ ▁Pro pos als ▁to ▁use ▁nucle us ▁transfer ▁techniques ▁in ▁human ▁stem ▁cell ▁research ▁raise ▁a ▁set ▁of ▁concerns ▁beyond ▁the ▁moral ▁status ▁of ▁any ▁created ▁emb ry o . ▁These ▁have ▁led ▁to