PKCδ is widely expressed in the mouse and human hematopoietic systems (Limnander et al, 2011), and one of its best‐studied functions in hematopoiesis is in B‐cell signaling, where PKCδ deficiency enhances B‐cell proliferation and leads to autoimmunity in mice and man (Miyamoto et al, 2002; Guo et al, 2004; Limnander et al, 2011). Here, PRKCD is linked to Autoimmunity.