CD194 (CCR4) antibodies, human

CD194 (CCR4) antibodies, human

Clone: REA279 | Dilution: 1:50
Clone REA279 recognizes the CD194 antigen, a seven-transmembrane G-protein–coupled receptor also known as C-C chemokine receptor type 4 (CCR4). CD194 is expressed on activated Tʜ2 cells, regulatory T cells, a subset of B cells, activated NK cells, basophils, monocytes, NK cells, and platelets. It is expressed at high levels by skin-infiltrating lymphocytes, at lower levels by lung and synovial fluid lymphocytes, but never by intestinal lymphocytes. CD194 is the specific receptor for the chemokines CCL17 (TARC) and CCL22 (MDC). Human peripheral blood regulatory T cells can be divided into two distinct populations based on the expression of CCR4. The majority of freshly isolated regulatory T cells express CD194 and represent memory-type regulatory T cells, while CD194 regulatory T cells require anti-CD3 antibody–mediated activation to acquire a regulatory activity. Depletion of 194
T cells leads to Tʜ1-type polarization of CD4
T cells and augmentation of CD8
T cell responses to tumor antigens.
Additional information: Clone REA279 displays negligible binding to Fc receptors.

Alternative Names


Technical specifications

  • Antigen: CD194 (CCR4)
  • Clone: REA279
  • Isotype: recombinant human IgG1
  • Isotype control: REA Control (S) antibodies
  • Alternative names of antigen: CCR4, CC-CKR-4, CKR4, CMKBR4, CHEMR13, K5-5
  • Entrez Gene ID: 1233
  • Molecular mass of antigen [kDa]: 41
  • Distribution of antigen: T cells, B cells, NK cells, monocytes
  • Product format: Reagents are supplied in buffer containing stabilizer and 0.05% sodium azide.
  • Fixation: Cells should be stained prior to fixation, if formaldehyde is used as a fixative.
  • Storage: Store protected from light at 2–8 °C. Do not freeze.
  • Available conjugates: APC
REAfinity clone is tested against different known clones, in a blocking experiment, to identify whether they recognize completely overlapping (++), partially overlapping (+), or completely different epitopes (-). In a blocking experiment, cells are incubated with an excess of purified unconjugated REAfinity clone followed by staining with conjugated form of the other known clones. 
Other clonesOverlap in epitope recognition with REA279
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