Human FOLR3 Antibody

Catalog # Availability Size / Price Qty
Detection of Human FOLR3 by Western Blot.
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Product Details
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Human FOLR3 Antibody Summary

Species Reactivity
Detects human FOLR3 in direct ELISAs and Western blots. In direct ELISAs, approximately 10% cross‑reactivity with recombinant human (rh) FOLR2 is observed and less than 1% cross-reactivity with rhFOLR1 is observed.
Polyclonal Sheep IgG
Antigen Affinity-purified
Mouse myeloma cell line NS0-derived recombinant human FOLR3 long isoform
Accession # P41439
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.


Recommended Concentration
Western Blot
1 µg/mL
See below
Ready to be labeled using established conjugation methods. No BSA or other carrier proteins that could interfere with conjugation.
Intracellular Staining by Flow Cytometry
2.5 µg/106 cells
See below

Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.

Data Examples

Western Blot View Larger

Detection of Human FOLR3 by Western Blot. Western blot shows lysates of JEG‑3 human epithelial choriocarcinoma cell line. PVDF membrane was probed with 1 µg/mL of Sheep Anti-Human FOLR3 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF5319) followed by HRP-conjugated Anti-Sheep IgG Secondary Antibody (HAF016). A specific band was detected for FOLR3 at approximately 36 kDa (as indicated). This experiment was conducted under reducing conditions and using Western Blot Buffer Group 1.

Intracellular Staining by Flow Cytometry Detection of FOLR3 antibody in KG-1 Human Cell Line antibody by Flow Cytometry. View Larger

Detection of FOLR3 in KG‑1 Human Cell Line by Flow Cytometry. KG-1 human acute myelogenous leukemia cell line was stained with Sheep Anti-Human FOLR3 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF5319, filled histogram) or isotype control antibody (Catalog # 5-001-A, open histogram), followed by NorthernLights™ 637-conjugated Anti-Sheep IgG Secondary Antibody (Catalog # NL011). To facilitate intracellular staining, cells were fixed with paraformaldehyde and permeabilized with saponin.

Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Preparation and Storage

Reconstitute at 0.2 mg/mL in sterile PBS.
Reconstitution Buffer Available
Reconstitution Buffer 1 (PBS)
Catalog #
Size / Price
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
Stability & Storage
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 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.

Background: FOLR3

Folate receptor 3 (FOLR3), also known as folate receptor gamma, is a 32 kDa protein that binds folic acid and reduced folates. Dietary folates are required for many key metabolic processes including nucleotide and methionine synthesis, the interconversion of glycine and serine, and histidine breakdown (1). Mature FOLR3 is a glycosylated protein that contains an imperfect carboxy terminal GPI anchor sequence (2, 3). A fraction of FOLR3 is GPI-linked to the cell surface, but the majority is released as a secreted protein (2). Mature human FOLR3 shares 74% and 83% amino acid (aa) sequence identity with FOLR1 and FOLR2, respectively. Orthologs of human FOLR3 have not been described in mouse or rat. A genetic polymorphism generates a truncated isoform that lacks the carboxy terminal 139 aa (2, 4). FOLR3 is expressed by cells of the myelocyte and B lymphocyte lineage as well as by various carcinomas (2, 3). FOLR3 is more highly expressed in ovarian carcinomas than in breast carcinomas or mesotheliomas (5). Unlike other folate receptors, FOLR3 does not exhibit stereoselectivity in the binding of folates (3).

  1. Fowler, B. et al. (2001) Kidney Int. 59:S-221.
  2. Shen, F. et al. (1994) Biochemistry 33:1209.
  3. Shen, F. et al. (1995) Biochemistry 34:5660.
  4. Wang, H. et al. (1998) Nucl. Acids Res. 26:2132.
  5. Yuan, Y. et al. (2009) Hum. Pathol. May 18 epub.
Long Name
Folate Receptor 3
Entrez Gene IDs
2352 (Human)
Alternate Names
folate receptor 3 (gamma); Folate receptor 3; folate receptor gamma; FOLR3; FR-G; FR-gamma; gamma-hFR

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