Combined T and B Cell Immunodeficiency is related to immunodeficiency 16 and immunodeficiency 11a. An important gene associated with Combined T and B Cell Immunodeficiency is ARPC1B (Actin Related Protein 2/3 Complex Subunit 1B), and among its related pathways/superpathways are NF-kappaB Signaling and B Cell Receptor Signaling Pathway. Affiliated tissues include neutrophil and lung, and related phenotypes are immune system and hematopoietic system