The G42-8 monoclonal antibody specifically recognizes the alpha subunit (32 kDa) of CD8αα homodimer or CD8αβ heterodimer. The CD8 molecule binds to HLA class I molecules during interaction of CD8+ T cells with antigen-presenting cells or target cells. CD8 is expressed on T cytotoxic/suppressor cell populations. G42-8 stains approximately 13-48% of peripheral blood lymphocytes and 80% of thymocytes, as well as a subset of NK cells. This antibody is useful in detecting CD8+ T cells when using DimerX I reagents.
The antibody was conjugated to BD Horizon Red 718, which has been developed exclusively for BD Biosciences as a better alternative to Alexa Fluor® 700. BD Horizon Red 718 can be excited by the red laser (628 – 640 nm) and, with an Em Max around 718 nm, it can be detected using a 730/45 nm filter. Due to similar excitation and emission properties, we do not recommend using R718 in combination with APC-R700 or Alexa Fluor® 700.