The EasySep™ Release Mouse CD4+ CD304+ Regulatory T-Cell Isolation Kit from STEMCELL Technologies is a mouse Treg isolation kit that targets the CD304 surface marker, which, unlike the CD25 Treg marker commonly used for Treg isolation, does not interfere with IL-2 signaling. Following cell isolation with this EasySep kit, antibody complexes remain bound to the cell surface and may interact with Brilliant Violet™ antibody conjugates, polyethylene glycol–modified proteins, or other chemically related ligands.