Agammaglobulinemia, also known as hypogammaglobulinemia, is related to agammaglobulinemia 1, autosomal recessive and agammaglobulinemia 4, autosomal recessive. An important gene associated with Agammaglobulinemia is BTK (Bruton Tyrosine Kinase), and among its related pathways/superpathways are Innate Immune System and Class I MHC mediated antigen processing and presentation. The drugs Immunoglobulin G and Immunoglobulins have been mentioned in the context of this disorder. Affiliated tissues include bone marrow and bone, and related phenotypes are splenomegaly and abnormal b cell count