HBB and Schnyder corneal dystrophy: The in vitro gene editing of HSPCs is mainly performed in the following ways: (1) The mutated HBB gene is repaired either by correctly the mutated SCD‐associated codon from valine (GTG) back to the wild‐type glutamate (GAG) or the naturally occurring benign alanine (GCG) found in the nonsickling HbG‐Makassar variant.8, 122