Human Pref‑1/DLK‑1/FA1 Biotinylated Antibody

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Human Pref‑1/DLK‑1/FA1 Biotinylated Antibody Summary

Species Reactivity
Detects human Pref‑1/DLK‑1/FA1 in Western blots. In this format, approximately 25% cross-reactivity with recombinant mouse Pref‑1 is observed.
Polyclonal Goat IgG
Antigen Affinity-purified
Mouse myeloma cell line NS0-derived recombinant human Pref-1 long isoform
Ala24-Pro297 with Arg248Pro and Lys295Ser substitutions
Accession # AAA75364
Lyophilized from a 0.2 μm filtered solution in PBS with BSA as a carrier protein.


Recommended Concentration
Western Blot
0.1 µg/mL
Recombinant Human Pref‑1/DLK‑1/FA1

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.

Reconstitution Calculator

Reconstitution Calculator

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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.
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: Pref-1/DLK1/FA1

Pref-1 (Preadipocyte factor 1; also DLK-1 and FA1) is a 58-65 kDa member of the Notch/Serrata/Delta family of proteins.  It is expressed in prechondrocytes and preadipocytes and appears to block progenitor cell differentiation into mature cell lineages.  Mature human Pref-1 is a 360 amino acid (aa) type I transmembrane N- and O-linked glycoprotein.  It contains a 280 aa extracellular region (aa 24-303), a 24 aa transmembrane segment (aa 304-327), and a 56 aa cytoplasmic domain (aa 328-383).  The extracellular region contains six EGF-like domains, and undergoes proteolytic cleavage to generate a bioactive 50 kDa fragment, plus three 25-31 kDa fragments that show no activity.  There are multiple potential splice variants.  One shows a deletion of aa 229-301, a second possesses a six aa substitution for aa 1-52, a third shows a deletion of aa 210-277, while a fourth contains a six aa substitution for aa #207-383.  Over aa 24-297, human Pref-1 shares 82% aa identity with mouse Pref-1. 

Long Name
Preadipocyte Factor-1/Protein delta Homolog 1/Fetal Antigen 1
Entrez Gene IDs
8788 (Human); 13386 (Mouse)
Alternate Names
delta-like 1 homolog (Drosophila); DLK; DLK1; DLK-1; FA1; FA1fetal antigen 1; pG2; pG2delta-like homolog (Drosophila); preadipocyte factor 1; Pref1; Pref-1; protein delta homolog 1; secredeltin; ZOG

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