The RB6-8C5 antibody binds to mouse Ly-6G/Ly-6C, commonly known as Gr-1, a member of the Ly-6 superfamily of GPI-anchored cell surface proteins with roles in cell signaling and cell adhesion. Gr-1 is differentially expressed during development and maturation of cells in the myeloid lineage and is expressed at varying stages and levels on monocytes, macrophages, granulocytes, and peripheral neutrophils.