Human FOLR4 Antibody

Catalog # Availability Size / Price Qty
Detection of Human FOLR4 by Western Blot.
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Product Details
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Human FOLR4 Antibody Summary

Species Reactivity
Detects human FOLR4 in direct ELISAs and Western blots. In direct ELISAs, less than 5% cross-reactivity with recombinant human (rh) FOLR1, rhFOLR2, and rhFOLR3 is observed.
Polyclonal Sheep IgG
Antigen Affinity-purified
E. coli-derived recombinant human FOLR4
Accession # NP_001073955
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied as a 0.2 µm filtered solution in PBS.


Recommended Concentration
Western Blot
1 µg/mL
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 Example

Western Blot Detection of Human FOLR4 antibody by Western Blot. View Larger

Detection of Human FOLR4 by Western Blot. Western blot shows lysates of A431 human epithelial carcinoma cell line. PVDF Membrane was probed with 1 µg/mL of Sheep Anti-Human FOLR4 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF6328) followed by HRP-conjugated Anti-Sheep IgG Secondary Antibody (Catalog # HAF016). A specific band was detected for FOLR4 at approximately 36 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 8.

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: FOLR4

FOLR4 (Folate receptor 4; also FR4 and folate receptor δ and folate binding protein 3) is a 34‑36 kDa member of the folate receptor family of molecules. Based on mouse, it appears to be a marker for subsets of T cells. In particular, and in conjunction with CD25, FR4hiCD25hi expression defines T reg cells, FR4loCD25+ expression pattern identifies effector memory T cells, and a FR4hiCD25- combination characterizes central memory T cells. Mature human FOLR4 is 225 amino acids (aa) in length (aa 20‑244). It contains virtually no identifiable motifs. There is one potential splice variant that shows a five aa substitution for aa 111‑116. Over aa 134‑220, human FOLR4 shares 72% aa identity with mouse FOLR4.

Long Name
Folate Receptor 4
Entrez Gene IDs
390243 (Human); 64931 (Mouse); 690037 (Rat)
Alternate Names
folate receptor 4 (delta) homolog (mouse); Folbp3; FOLR4; FR-delta; LOC390243; probable folate receptor delta

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