原文是all 12 hESC lines derived from such arrested embryos have been1 r# l! P( p0 U2 g: b7 }5 f
shown to be karyotypically normal and their pluripotency 3 s* I6 {8 f ~9 L# aand differentiation potential has been demonstrated both in5 F. ]" o7 [; s% j% V
vitro and in vivo.