Anti-REL (phospho S503) Antibody

Raised in rabbits and affinity-purified, this unconjugated polyclonal IgG antibody from Antibodies.com binds specifically to the phosphorylated serine 503 residue of human REL (c-Rel), a member of the NF-κB/Rel family of transcription factors involved in immune cell signalling. The reagent is supplied as a 200 µl liquid aliquot and is validated for immunofluorescence (IF) applications on human-derived samples, allowing visualisation of the activated, post-translationally modified form of c-Rel in fixed cell preparations. Because the antibody is unconjugated, it can be paired with a user-selected fluorophore-conjugated secondary reagent for flexible IF panel design. The IgG isotype, polyclonal background, and rabbit host species support broad epitope coverage of the phospho-S503 region. For best results, store refrigerated at 4 °C, aliquot to avoid repeated freeze-thaw cycles, and handle the product away from direct light to preserve antibody integrity.