Alexa Fluor® 488 Mouse Anti-Human CD5 Antibody (S-2877)

CD5 is a 67 kDa type I cell surface glycoprotein that belongs to the scavenger receptor cysteine-rich (SRCR) family. It is expressed on all T cells and a subset of B cells known as B-1a cells. CD5 plays a crucial role in regulating T cell receptor (TCR) signaling and acts as a negative regulator of T cell activation. It helps fine-tune the threshold for T cell activation during thymocyte development and suppresses peripheral T cell activation by inhibiting TCR-proximal signaling. In B-1a cells, CD5 helps prevent self-reactivity by dampening B cell receptor (BCR) signals. The expression of CD5 is also associated with cell survival, apoptosis, and the development of regulatory T cells. Additionally, CD5 may be involved in the regulation of dendritic cell function and cytokine production.