Lefty Antibody


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Product Details

Reactivity Hu, MuSpecies Glossary
Applications WB

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Lefty Antibody Summary

Mouse myeloma cell line NS0-derived recombinant mouse Lefty-1
Leu22-Arg135, His6, Leu136-Pro368
Accession # Q64280
Detects human and mouse Lefty in direct ELISAs and Western blots.
Immunogen affinity purified
Purity Statement
Antigen Affinity-purified
Innovator's Reward
Test in a species/application not listed above to receive a full credit towards a future purchase.


  • Western Blot 0.1 ug/mL
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AF746 in the following applications:

Packaging, Storage & Formulations

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.
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.
No Preservative
Immunogen affinity purified
Reconstitution Instructions
Reconstitute at 0.2 mg/mL in sterile PBS.


This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for Lefty Antibody

  • Lefty


Lefty was first identified in a screen for undifferentiated cell-specific cDNAs from the P19 mouse embryonal carcinoma cells. Its mRNA expression on the left side of the developing embryo earned it the name “lefty”. Two genes exist in mouse (Lefty-1 and Lefty-2) and two in humans (Lefty-A (ebaf) and Lefty-B). By amino acid sequence, mouse Lefty-1 and -2 are more similar to each other (90%) than to either Lefty-A or -B in humans (81 - 82% identical). Lefty contains the six cysteine residues that are conserved among TGF-beta related proteins and that are necessary to form the cysteine-knot structure. However, lefty is distinct from other family members in that it has two RXXR cleavage sites, a longer carboxy terminal sequence, and it lacks the cysteine residue required for intermolecular disulfide linkage. Thus, mature forms of lefty are larger than mature forms of other TGF-beta -related proteins. Mouse Lefty-1 is differentially processed depending on the cells in which it is synthesized, and both processing sites can be utilized.

Lefty homologues have been identified in other vertebrate organisms including chick, frog, and zebrafish. Although the amino acid sequence identity is not well conserved among vertebrate species, the expression pattern of lefty on the left side is well conserved. Lefty-1 is expressed strongly on the left side of the prospective floor plate and weakly in the left half of the lateral plate mesoderm in E8 mice embryos. In all species examined, lefty proteins function in patterning left-right asymmetry of the developing organ systems such as the heart and lung. Lefty acts as an antagonist to Nodal signaling, potentially by competing for binding to a common receptor.

  1. Meno, C. et al. (1996) Nature 381:151.
  2. Meno, C. et al. (1997) Genes Cells 2:513.
  3. Meno, C. et al. (1998) Cell 94:287.
  4. Kosaki, K. et al. (1999) Am. J. Hum. Genet. 64:712.
  5. Schier, A.F. and M.M. Shen (1999) Nature 403:385.
  6. Branford, W.W. et al. (2000) Dev. Biol. 223:291.


This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

Publications for Lefty Antibody (AF746)(1)

We have publications tested in 1 confirmed species: Mouse.

We have publications tested in 1 application: IHC-Fr.

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Secondary Antibodies


Isotype Controls

Other Available Formats

Biotin BAF746

Additional Lefty Products

Array AF746

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Gene Symbol LEFTY2