Human CRTAC1 Isoform 1 Biotinylated Antibody

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Human CRTAC1 Isoform 1 Biotinylated Antibody Summary

Species Reactivity
Detects human CRTAC1 Isoform 1 in Western blots. In Western blots, approximately 25% cross-reactivity with recombinant human CRTAC1 Isoform 2 is observed.
Polyclonal Sheep IgG
Antigen Affinity-purified
Mouse myeloma cell line NS0-derived recombinant human CRTAC1 isoform 1
Accession # Q9NQ79
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 CRTAC1 Isoform 1

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.

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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: CRTAC1

CRTAC1 (cartilage acidic protein 1; also CEP-68) is a 95‑105 kDa member of a novel family of EGF domain-containing proteins. It is secreted by articular chondrocytes and may play a role in either cartilage matrix organization, or cell-matrix adhesion. Mature human CRTAC1 is 634 amino acids (aa) in length. It contains four FG-GAP (PheGly-GlyAlaPro) domains (aa 46‑437) and one EGF-like motif (aa 559‑605). Multiple splice forms exist. There are two alternate start sites at Met9 and Met211 that may be accompanied by a 39 aa substitution for the C-terminal 55 aa, or an 84 aa substitution for aa 545‑661. Over aa 28‑661, human CRTAC1 shares 91% aa identity with mouse CRTAC1. This form in mouse, however, is more equivalent to the human isoform that shows a C-terminal 39 aa substitution. In this case, there is 95% aa identity between mouse and human.

Long Name
Cartilage Acidic Protein 1
Entrez Gene IDs
55118 (Human); 72832 (Mouse); 171438 (Rat)
Alternate Names
ASPIC; ASPIC1; ASPIC1CEP-68acidic secreted protein in cartilage; cartilage acidic protein 1; CEP68; chondrocyte expressed protein 68 kDa CEP-68,68 kDa chondrocyte-expressed protein; CRTAC1; FLJ10320

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