The V13-864 monoclonal antibody specifically recognizes CX3C motif chemokine Ligand 1 (CX3CL1), which is also known as fractalkine. CX3CL1 (Fractalkine) is the only known member of the CX3C chemokine subfamily and is expressed as both membrane-bound and secreted forms. Unlike other chemokines, CX3CL1is expressed on the surface of endothelial cells and not significantly expressed on peripheral blood leukocytes. CX3CL1's receptor is known as CX3CR1 and is expressed on cytotoxic T cells, NK cells, dendritic cells, and monocytes. Overexpression of CX3CL1 (Fractalkine) in some malignant tumors may contribute to the recruitment of effectors for innate and adaptive immunity.
The antibody was conjugated to BD Horizon™ BB515 which is part of the BD Horizon Brilliant™ Blue family of dyes. With an Ex Max near 490 nm and an Em Max near 515 nm, BD Horizon™ BB515 can be excited by the blue laser (488 nm) laser and detected with a 530/30 nm filter. This dye has been exclusively developed by BD Biosciences and is up to seven times brighter than FITC with less spillover into the PE channel. Due to similar excitation and emission properties, BB515, FITC, and Alexa Fluor™ 488 cannot be used simultaneously. It is not recommended to use BB515 in cocktails that include Streptavidin conjugates as it may cause high background.