Embryonic stem cells are capable of innately forming tissue structures without genetic alterations.
Ref.: Mototsugu Eiraku et al., Self-organizing optic-cup morphogenesis in three-dimensional culture, Nature, April 6, 2011
Ref.: Mototsugu Eiraku et al., Self-organizing optic-cup morphogenesis in three-dimensional culture, Nature, April 6, 2011