Immunodeficiency 27b, also known as autosomal dominant mendelian susceptibility to mycobacterial diseases due to partial ifngammar1 deficiency, is related to immunodeficiency 27a and helicobacter pylori infection. An important gene associated with Immunodeficiency 27b is IFNGR1 (Interferon Gamma Receptor 1), and among its related pathways/superpathways are Innate Immune System and Cytokine Signaling in Immune system. Related phenotypes are immunodeficiency and osteomyelitis