KEGG enrichment items indicated that FCRLA and its co‐expressed genes were mainly enriched in the following pathways: primary immunodeficiency, cytokine‐cytokine receptor interaction, hematopoietic cell lineage, T cell receptor signaling pathway, T helper (Th) 17 cell differentiation, B cell receptor signaling pathway, the intestinal immune network for IgA production, NF‐kappa B signaling pathway, Th1 and Th2 cell differentiation, and cell adhesion molecules (Figure 5E). The gene discussed is CD79A; the disease is inborn error of immunity.