Teratogenic

In particular, the impact of the biomaterial used remains to be defined; grafting (biotissue can be introduced via direct cell implantation (cell therapy), biotissue transplantation, or gene therapy); risk of teratogenic effect and of immune reaction (i.e., in the umbilical cord cells the immune risk being weaker); religious and legal issues with respect to the different country regulations.

[…] as well as chemicals (potentially toxic) used in daily routine in research and educational institutes, industries (e.g., carcinogenic, mutagenic and teratogenic) and in household that may confer danger to the living beings if discharged in the umbworld.