T Cell Deficiency, also known as t lymphocyte immunodeficiency, is related to t-cell immunodeficiency with thymic aplasia and good syndrome. An important gene associated with T Cell Deficiency is PAX1 (Paired Box 1), and among its related pathways/superpathways are Innate Immune System and MIF Mediated Glucocorticoid Regulation. The drugs Busulfan and Tacrolimus have been mentioned in the context of this disorder. Affiliated tissues include t cells and b cells, and related phenotypes are endocrine/exocrine gland and cellular