About CD8a
The CD8 antigen is a cell surface glycoprotein found on most cytotoxic T lymphocytes that mediates efficient cell-cell interactions within the immune system. The CD8 antigen acts as a coreceptor with the T-cell receptor on the T lymphocyte to recognize antigens displayed by an antigen presenting cell in the context of class I MHC molecules. The coreceptor functions as either a homodimer composed of two alpha chains or as a heterodimer composed of one alpha and one beta chain. Both alpha and beta chains share significant homology to immunoglobulin variable light chains. This gene encodes the CD8 alpha chain. Multiple transcript variants encoding different isoforms have been found for this gene. The major protein isoforms of this gene differ by the presence or absence of a transmembrane domain and thus differ in being a membrane-anchored or secreted protein. [provided by RefSeq, May 2020]

About APC-eFluor 780
APC-eFluor™ 780 (APC-eF780) is a red-emitting tandem fluorophore of APC, excited by the 640 nm red laser and transfers energy to the acceptor, eF780, which emits light that can be captured with a 780/60 nm bandpass filter. APC-eF780 has an excitation peak at 645 nm and an emission peak at 767 nm, and is spectrally similar to APC-CF®750 (Biotium), APC-Cy® 7 (GE Healthcare) APC-H7 (BD Biosciences), APC-eFluor™ 780 (ThermoFisher Scientific), APC-Vio®770 (Miltenyi Biotec) and APC-Fire™ 750 (BioLegend). This dye is part of the larger eFluor™ dye family, developed by eBioscience which is now part of ThermoFisher Scientific.