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Updated: Jan 19, 2026

Detection of True IgE-expressing Mouse B Lineage Cells
Published on: December 1, 2014
True Detective: Unraveling Group 1 Innate Lymphocyte Heterogeneity
Luke Riggan1, Aharon G Freud2, Timothy E O'Sullivan1
1Department of Microbiology, Immunology, and Molecular Genetics, David Geffen School of Medicine at UCLA, Los Angeles, CA 900953, USA; Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.
Abstract:
Innate lymphoid cells (ILCs) consist of a heterogeneous family of lymphocytes that regulate tissue homeostasis and can contribute to pathology in mice and humans. Mammalian group 1 ILCs are defined by the production of interferon (IFN)-γ and the functional dependence on the transcription factor T-bet. While recent studies demonstrate that group 1 ILCs consist of circulating mature natural killer (NK) cells and tissue-resident ILC1s, the functional, phenotypic, and developmental properties that distinguish these two cell lineages are often confusing and difficult to dissect. In this review, we critically evaluate the current knowledge of mammalian group 1 ILC heterogeneity and propose new inclusive nomenclature to clarify the roles of ILC1s and NK cells during homeostasis and disease.
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