Immunodeficiency 15a, also known as imd15a, is related to transient neonatal thrombocytopenia and immunodeficiency 26. An important gene associated with Immunodeficiency 15a is IKBKB (Inhibitor Of Nuclear Factor Kappa B Kinase Subunit Beta), and among its related pathways/superpathways are NF-kappaB Signaling and DDX58/IFIH1-mediated induction of interferon-alpha/beta. Affiliated tissues include t cells and b cells, and related phenotypes are decreased proportion of memory b cells and decreased proportion of cd8-positive t cells