A) Gene discovery sheds light on immune system mysteries. B) UNMC researchers identify gene causing rare fatal immunological problem in males C) Lymphoproliferative Disorders D) XLP Registry E) X-Linked Lymphoproliferative Syndrome F) X-Linked Lymphoproliferative Syndrome. An immunodeficiency disorder with acquired agammaglobunemia,fatal infectious mononucleosis or malignant lymphoma. G) XLinked Lymphoproliferative Syndrome H) Search for XLP in this site - eMedicine I) SH2D1A mutations. J) SAP: The gene responsible for X-Linked lymphoproliferative disease