It would be identity‐altering if it caused a different chain of psychological connectedness and continuity on a psychological or narrative account of identity.21 Persson rejects this interpretation,22 but other authors, such as McMahan, think that interventions of this kind can be identity‐determining.23 Thus, if the deletion of CCR5 or off‐target effects caused significant intellectual disability, they would be identity‐altering.24 As we have mentioned, CCR5 has been implicated in brain development. The gene discussed is CCR5; the disease is Intellectual disability.