About CD137L
The protein encoded by this gene is a cytokine that belongs to the tumor necrosis factor (TNF) ligand family. This transmembrane cytokine is a bidirectional signal transducer that acts as a ligand for TNFRSF9/4-1BB, which is a costimulatory receptor molecule in T lymphocytes. This cytokine and its receptor are involved in the antigen presentation process and in the generation of cytotoxic T cells. The receptor TNFRSF9/4-1BB is absent from resting T lymphocytes but rapidly expressed upon antigenic stimulation. The ligand encoded by this gene, TNFSF9/4-1BBL, has been shown to reactivate anergic T lymphocytes in addition to promoting T lymphocyte proliferation. This cytokine has also been shown to be required for the optimal CD8 responses in CD8 T cells. This cytokine is expressed in carcinoma cell lines, and is thought to be involved in T cell-tumor cell interaction.[provided by RefSeq, Oct 2008]

About PE-Dazzle 594
PE-Dazzle® 594 (RPE-Dazzle 594) from Biolegend is a red-emitting tandem fluorophore that combines pycoerythrin (PE) and Dazzle 594. The donor molecule, PE can be excited by the 488-nm blue, 532-nm green, or 561-nm yellow-green laser and and transfers energy to the acceptor molecule, Dazzle 594, which emitts light that can be captured with a 610/20 nm bandpass filter. PE-Dazzle 594 has an excitation peak at 565 nm and an emission peak at 610 nm, and is suitable alternative to PE-Texas Red, PE-eF610, PE-Alexa Fluor™ 610 or PE-CF®594.