The Marrack ABC resembled extrafollicular (EF) B cells, or atypical B cells, that develop in autoimmunity (Jenks et al., 2018; Rubtsova et al., 2017) and in chronic infections in humans (Courey‐Ghaouzi et al., 2022; Sutton et al., 2021) as all share CD11c and T‐bet expression. The gene discussed is ITGAX; the disease is Autoimmunity.