Nk Cell Deficiency is related to immunodeficiency 55 and immunodeficiency 21. An important gene associated with Nk Cell Deficiency is MCM10 (Minichromosome Maintenance 10 Replication Initiation Factor), and among its related pathways/superpathways are Innate Immune System and Class I MHC mediated antigen processing and presentation. Affiliated tissues include nk cells and bone marrow, and related phenotypes are immune system and hematopoietic system