embryo

They are working toward creating a child born from an embryo edited to prevent a hereditary disease.

The technique also successfully repaired mutations linked to scoliosis in zebrafish embryos.

Then they began the delicate process of transferring an embryo to the woman that would hopefully carry and deliver their baby.

Some may prevent fertilization or normal embryo development, while others could cause miscarriage.

Because the egg retrieval process is involved, and not all will yield healthy embryos, medical professionals make extra, ultimately discarding those that are not used.