PHOX2B (Paired mesoderm homeobox protein 2B; also NBPhox) is a 33-35 kDa member of the paired homeobox family of transcription factors. It is not actually a mesoderm-associated protein, but is instead apparently restricted to neuronal precursors and mature neurons. It is found in glutamatergic neurons of the NTS and in neurons that demarcate the respiratory chemoreception pathway. In addition, PHOX2B is essential to the development of noradrenergic adrenal chromaffin and sympathetic motor neurons. Human PHOX2B is 314 amino acids (aa) in length. It contains one DNA binding homeobox domain (aa 98-157), and two poly-Ala sequences, one between aa 159-167, and another between aa 241-260. Alanine extensions involving anywhere from 5 to 11 Ala residues may exist. These change the nature of the PHOX2B molecule. While wild-type PHOX2B is nuclear, Ala extensions promote its retention in the cytoplasm with loss of activity. PHOX2B may potentially form oligomers with itself, or it paralogue, PHOX2A. Human and mouse PHOX2B are identical in aa sequence.
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Immunogen
Met1-Glu94
Accession # Q99453
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Scientific Data Images for Human/Mouse PHOX2B Antibody
PHOX2B in IMR-32 Human Cell Line.
PHOX2B was detected in immersion fixed IMR-32 human neuroblastoma cell line using Goat Anti-Human PHOX2B Antigen Affinity-purified Polyclonal Antibody (Catalog # AF4940) at 10 µg/mL for 3 hours at room temperature. Cells were stained using the NorthernLights™ 557-conjugated Anti-Goat IgG Secondary Antibody (red, upper panel; Catalog # NL001) and counterstained with DAPI (blue, lower panel). Specific staining was localized to nuclei and cytoplasm. View our protocol for Fluorescent ICC Staining of Cells on Coverslips.
Detection of PHOX2B by Immunohistochemistry
GPR4 transcript and protein expression in the retrotrapezoid nucleus (RTN). A, RNAscope multiplex in situ hybridization (ISH) labeling for Gpr4 and the RTN marker Nmb at bregma level −6.48 mm. Arrowheads indicate RTN neurons that coexpress Nmb and Gpr4; arrows indicate more dorsally located neurons with high levels of Nmb that do not express Gpr4 (Shi et al., 2017). B, C, HA immunostaining in the RTN of Gpr4HA/HA (B) and wild-type Gpr4+/+ (C) mice; RTN neurons are identified by expression of PHOX2B. D, Representative maps of PHOX2B+/HA+ cells and PHOX2B-only cells through the rostrocaudal extent of the RTN (top, bregma −5.8 to −7.08), and average distribution of HA+ cells through the RTN (bottom). Data were averaged (±SEM) from four mice; scale bar, 50 µm. Image collected and cropped by CiteAb from the following open publication (https://www.eneuro.org/lookup/doi/10.1523/ENEURO.0002-24.2024), licensed under a CC-BY license. Not internally tested by R&D Systems.Applications for Human/Mouse PHOX2B Antibody
Immunocytochemistry
Sample: Immersion fixed IMR-32 human neuroblastoma cell line
Reviewed Applications
Read 1 review rated 5 using AF4940 in the following applications:
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Reconstitution
Reconstitute at 0.2 mg/mL in sterile PBS. For liquid material, refer to CoA for concentration.
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Stability & Storage
- 12 months from date of receipt, -20 to -70 °C as supplied.
- 1 month, 2 to 8 °C under sterile conditions after reconstitution.
- 6 months, -20 to -70 °C under sterile conditions after reconstitution.
Calculators
Background: PHOX2B
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Product Documents for Human/Mouse PHOX2B Antibody
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Product Specific Notices for Human/Mouse PHOX2B Antibody
For research use only
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Application: Immunocytochemistry/ImmunofluorescenceSample Tested: hiPSC-derived sympathoblastsSpecies: HumanVerified Customer | Posted 07/28/2025PHOX2B was detected in 4%PFA-fixed hiPSC-derived sympathoblasts using Goat Anti-Human PHOX2B Antigen Affinity-purified Polyclonal Antibody (Catalog # AF4940) at 5 µg/mL for 1 hour at room temperature. Cells were then stained with a Cy3-conjugated donkey anti-goat IgG secondary antibody (yellow), and counterstained with DAPI (cyan). Specific staining was localized to the nuclei.
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Protocols
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- Appropriate Fixation of IHC/ICC Samples
- Cellular Response to Hypoxia Protocols
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- Detection & Visualization of Antibody Binding
- ICC Cell Smear Protocol for Suspension Cells
- ICC Immunocytochemistry Protocol Videos
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- Immunocytochemistry (ICC) Protocol
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- Immunofluorescence of Organoids Embedded in Cultrex Basement Membrane Extract
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- Protocol for VisUCyte™ HRP Polymer Detection Reagent
- Protocol for the Fluorescent ICC Staining of Cell Smears - Graphic
- Protocol for the Fluorescent ICC Staining of Cultured Cells on Coverslips - Graphic
- Protocol for the Preparation and Fluorescent ICC Staining of Cells on Coverslips
- Protocol for the Preparation and Fluorescent ICC Staining of Non-adherent Cells
- Protocol for the Preparation and Fluorescent ICC Staining of Stem Cells on Coverslips
- Protocol for the Preparation of a Cell Smear for Non-adherent Cell ICC - Graphic
- TUNEL and Active Caspase-3 Detection by IHC/ICC Protocol
- The Importance of IHC/ICC Controls
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