About CTLA-4
This gene is a member of the immunoglobulin superfamily and encodes a protein which transmits an inhibitory signal to T cells. The protein contains a V domain, a transmembrane domain, and a cytoplasmic tail. Alternate transcriptional splice variants, encoding different isoforms, have been characterized. The membrane-bound isoform functions as a homodimer interconnected by a disulfide bond, while the soluble isoform functions as a monomer. Mutations in this gene have been associated with insulin-dependent diabetes mellitus, Graves disease, Hashimoto thyroiditis, celiac disease, systemic lupus erythematosus, thyroid-associated orbitopathy, and other autoimmune diseases. [provided by RefSeq, Jul 2008]

About Alexa Fluor 350
Alexa Fluor™ 350 (AF350, Alexa 350) has an excitation peak at 346 nm and an emission peak at 442 nm, and is spectrally similar in size, brightness and application to AMCA, DyLight™ 350 and CF®350. Alexa 350 is most commonly used in flow cytometery and fluorescence microscopy applications.