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Recombinant Human MEC (CCL28)


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Product Source Size Cat. No. Price
Recombinant Human MEC (CCL28) E. coli20 µg Z101025 $160.00
1.0 mg Z101029 $2,700.00
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Data Sheet
Print Version
Alternative Names C-C motif chemokine 28, CCL28, MEC, Protein CCK1, Small-inducible cytokine A28, SCYA28
Recombinant Human Mucosae-Associated Epithelial Chemokine (CCL28)
Description The mucosa-associated epithelial chemokine CCL28 is a common mucosal chemokine which is constitutively expressed by epithelial cells in most mucosal sites. Both CCL28 and CCL25 have recently been shown to be essential for lymphocyte migration to gastrointestinal tissues. CCL28 attracts IgA ASC, but not IgG or IgM ASC, from both intestinal and extraintestinal mucosal tissue, while CCL25 preferentially attracts IgA ASC from the small intestine and its draining lymphoid tissues, as well as alpha-4-beta-7(+) T cells.
Gene Symbol CCL28
Gene ID 56477
Accession No. Q9NRJ3
Source E. coli
Appearance Lyophilized Powder
Molecular Weight 12.0 kDa
Endotoxin Level <1.0 EU/μg of recombinant protein as determined by the LAL method.
Purity >95% as determined by SDS-PAGE
Bioactivity Determined by the ability to chemoattract human lymphocytes using a concentration range of 2-10 ng/mL.
Formulation Recombinant CCL-28 was lyophilized from PBS pH 7.4.
Reconstitution A quick spin of the vial followed by reconstitution in distilled water to a concentration not less than 0.1 mg/mL. This solution can then be diluted into other buffers.
Storage Upon reconstitution, this cytokine can be stored in working aliquots at 2° - 8°C for one month, or at -20°C for six months, with a carrier protein without detectable loss of activity. Avoid repeated freeze/thaw cycles.
Usage For research use only. Not for diagnostic or therapeutic use.
Product Documents
Product References
Submit a new question:
How are endotoxin levels measured?
1. For estimating the endotoxin levels; we use the LAL (Limulus Amebocyte Lysate) method: The lysate from horseshoe crab amebocytes clots in the presence of very low endotoxin. This reaction is the basis of the Limulus amebocyte lysate (LAL) assay which was approved by the FDA in 1970.

· Endotoxin is generally measured in Endotoxin Units per milliliter (EU/mL).

· For recombinant proteins: EU is reported per microgram of protein.

· One EU = 0.1-0.2 ng endotoxin/µg of protein.

· At abm, we do the LAL chromogenic assays that can detect down to 0.01 EU/ml.
With regard to the BSA levels in some Growth Factors and Cytokines, can you please provide an explanation as to why they are so high?
The amount of BSA, as part of the formulation of a protein, can vary considerably depending on how much BSA was deemed optimum/necessary for protein stability in combination with /in-lieu of - other possible additives. The aforementioned formulations are somewhat analogous to the “carrier” versions of many formulations from “R and D systems” that have as high as 50 µg of BSA per µg of the recombinant protein product. If, needed or desired, abm scientists can substitute BSA for other stabilizing additives for most formulations.
Are your Escherichia coli sourced growth factors: 1) Human derived materials free? 2) Recombinant proteins free?
Yes, all of abm's growth factors made in Escherichia coli using recombinant technology contain no human derived-products or other recombinant proteins. In the rare cases of BSA presence, this will be mentioned in the product's formulation.
What is the protein amino acids sequence? The recombinant construct represents the sequence following the removal of the signal peptide. The construct spans residue 20 – 127, inclusive.
The recombinant construct represents the sequence following the removal of the signal peptide. The construct spans residue 20 – 127, inclusive.