Type of antibody:
Releasable antibodies, Primary antibodies, Recombinant antibodies
Alternative names:
T44, Tp44

Specifications for CD28 Antibody, anti-human,


Clone REAL105 is an antibody fragment derived from the full CD28 antibody molecule. It displays no binding to Fc receptors. The recombinantly engineered antibody fragments are multimerized to form the REAlease Complex to bind markers with high avidity.
Clone REAL105 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.
The REAlease Kits consist of the respective fluorochrome-conjugated REAlease Complexes and the REAlease Support Kit for removal of the REAlease Complexes and optional relabeling with different fluorochrome-conjugated REAlease Complexes.

Alternative names

T44, Tp44

Detailed product information

Technical specifications

Isotype controlControl Antibody
Hostcell line
Type of antibodyReleasable antibodies, Primary antibodies, Recombinant antibodies
Alternative names of antigenT44, Tp44
Distribution of antigenthymocytes, plasma cells
RRIDAB_2751071, AB_2751456, AB_2751444, AB_2751102, AB_2751083, AB_2784110, AB_2784111, AB_2784109, AB_2751095

Resources for CD28 Antibody, anti-human,


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References for CD28 Antibody, anti-human,


  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. June, C. H. et al. (1990) Role of the CD28 receptor in T-cell activation. Immunol. Today 11(6): 211-216
  3. Linsley, P. S. et al. (1993) The role of the CD28 receptor during T cell responses to antigen. Annu. Rev. Immunol. 11: 191-212
  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. 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
  6. Bahlis, N. J. et al. (2007) CD28-mediated regulation of multiple myeloma cell proliferation and survival. Blood 109(11): 5002-5010

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