Cd40 Ligand Deficiency, also known as hyperimmunoglobulin m syndrome, is related to immunodeficiency with hyper-igm, type 5 and immunodeficiency with hyper-igm, type 2, and has symptoms including diarrhea An important gene associated with Cd40 Ligand Deficiency is CD40LG (CD40 Ligand), and among its related pathways/superpathways are ERK Signaling and Innate Immune System. The drugs gamma-Globulins and Immunoglobulin G have been mentioned in the context of this disorder. Affiliated tissues include spinal cord and t cells, and related phenotypes are Reduced mammosphere formation and homeostasis/metabolism