Recent reports on small numbers of lupus patients treated with CAR-T cells directed against CD19+ B lymphocytes have generated considerable excitement, not so much because the initial response to this therapy was favorable, but because after follow-up durations of two years or longer the patients were reported to have an ongoing clinical remission without the need for further treatment and in the absence of most autoantibodies. This state has been referred to in terms such as “immunological remission” or “resetting the immune system”, suggesting that an important and potentially permanent change had occurred. Perhaps we can call it a Deep Remission, for now. So what is this Deep Remission?