I-Stem has a cryobank which contains about 50 hES cell lines from about 15 monogenic diseases. These lines are imported from academic or private foreign laboratories or have been derived in France from embryos with mutations. Quality control tests are used to analyze their genetic identity and stability, and their undifferentiated state, their potential for differentiation as well has their lack of contamination .These processes are submitted to a perfect traceability as required by the Agence de Biomédicine. I-Stem’s hES bank is listed in the European Human Embryonic Stem Cell Registry.