Immunodeficiency 24, is also known as severe combined immunodeficiency due to ctps1 deficiency. An important gene associated with Immunodeficiency 24 is CTPS1 (CTP Synthase 1), and among its related pathways/superpathways are Metabolism and Amino acid metabolism. Affiliated tissues include b cells and t cells, and related phenotypes are recurrent viral infections and decreased proportion of memory b cells