Type of antibody:
Primary antibodies, Recombinant antibodies
recombinant human IgG1
Alternative names:
T44, Tp44

Specifications for CD28 Antibody, anti-human, REAfinity™


Clone REA612 recognizes the human CD28 antigen, a type I transmembrane protein, which is highly expressed on CD3
thymocytes, most peripheral thymocytes, and plasma cells but not in less mature B cells. Binding of CD28 to its ligands CD80 or CD86 costimulates T cell effector function and T cell–dependent antibody production
in vitro
in vivo
. In the presence of antibodies directed against CD2 and CD3, CD28 antibodies stimulate T cell proliferation and cytokine production.
Additional information: Clone REA612 displays negligible binding to Fc receptors.

Alternative names

T44, Tp44

Detailed product information

Technical specifications

Isotyperecombinant human IgG1
Isotype controlREA Control Antibody (S), human IgG1
Hostcell line
Type of antibodyPrimary antibodies, Recombinant antibodies
Alternative names of antigenT44, Tp44
Molecular mass of antigen [kDa]23
Distribution of antigenB cells, lymphocytes, T cells, plasma cells, thymocytes
Entrez Gene ID940
RRIDAB_2877015, AB_2877016, AB_2656957, AB_2656958, AB_2656961, AB_2656962, AB_2751569, AB_2751558, AB_2733368, AB_2733369, AB_2733110, AB_2733111, AB_2784108, AB_2784107, AB_2802065, AB_2802058, AB_2811384

Resources for CD28 Antibody, anti-human, REAfinity™


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References for CD28 Antibody, anti-human, REAfinity™


  1. Kozbor D. J. et al. (1987) Tp44 molecules involved in antigen-independent T cell activation are expressed on human plasma cells. J. Immunol. 138(12): 4128-4132
  2. Bahlis, N. J. et al. (2007) CD28-mediated regulation of multiple myeloma cell proliferation and survival. Blood 109(11): 5002-5010
  3. Krummel, M. F. and Allison, J. P. (1995) CD28 and CTLA-4 have opposing effects on the response of T cells to stimulation. J. Exp. Med. 182(2): 459-465
  4. Freeman, G. J. et al. (1993) Cloning of B7-2: a CTLA-4 counter-receptor that costimulates human T cell proliferation. Science 262(5135): 909-911
  5. Linsley, P. S. et al. (1993) The role of the CD28 receptor during T cell responses to antigen. Annu. Rev. Immunol. 11: 191-212
  6. June, C. H. et al. (1990) Role of the CD28 receptor in T-cell activation. Immunol. Today 11(6): 211-216

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