IL3 and congenital rubella syndrome: Compared to the cytokine release syndrome (CRS) of CAR T cells [55], CAR NK cells produce a different spectrum of cytokines including interferon-g (IFN-γ), granulocyte macrophage colony stimulating factor (GM-CSF) and interleukin-3 (IL-3), which cause limited damage to healthy tissues [56, 57].