About CD4
This gene encodes the CD4 membrane glycoprotein of T lymphocytes. The CD4 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 II MHC molecules. The CD4 antigen is also a primary receptor for entry of the human immunodeficiency virus through interactions with the HIV Env gp120 subunit. This gene is expressed not only in T lymphocytes, but also in B cells, macrophages, granulocytes, as well as in various regions of the brain. The protein functions to initiate or augment the early phase of T-cell activation, and may function as an important mediator of indirect neuronal damage in infectious and immune-mediated diseases of the central nervous system. Multiple alternatively spliced transcript variants encoding different isoforms have been identified in this gene. [provided by RefSeq, May 2020]

About Brilliant Violet 510
Brilliant™ Violet 510 (BV510) is a green-emitting non-tandem polymer fluorophore that can be excited by the 405 nm Violet laser and collected using a 510/50 bandpass filter. BV510 has an excitation peak at 405 nm and an emission peak at 510 nm, and is similar to StarBright Violet 515 (Bio-Rad). BV510 is most often used in flow cytometry due to its improved signal-to-noise over alternatives like V500 and AmCyan. This dye is part of the Brilliant™ Violet dye line. BV510 and BV480 are the only dyes in the Brilliant™ Violet dye family that are not tandem fluorophores based off the BV421 polymer core, but they have nearly the same maximum excitation.