Immunodeficiency 104, also known as severe combined immunodeficiency, autosomal recessive, t cell-negative, b cell-positive, nk cell-positive, is related to immunodeficiency 105 and t cell deficiency. An important gene associated with Immunodeficiency 104 is IL7R (Interleukin 7 Receptor), and among its related pathways/superpathways are Overview of interferons-mediated signaling pathway and Hematopoietic Stem Cells and Lineage-specific Markers. Affiliated tissues include t cells and nk cells, and related phenotypes are recurrent infections and failure to thrive