Answer
The patient’s own collected blood-forming stem cells, edited outside the body and cryopreserved before being returned.
Sources for this answer
- Casgevy 4-13 x 10Exp6 cells/mL dispersion for infusion — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.