This product is comprised of an anti-CD33 monoclonal antibody (Lintuzumab) labeled with iFluor 680. iFluor 680 is a near-IR-fluorescent dye and it's excitation/emission is 679/702 nm.
CD33 or Siglec-3 is a transmembrane receptor expressed on cells of myeloid lineage. It is usually considered myeloid-specific, but it can also be found on some lymphoid cells. It binds sialic acids, therefore is a member of the SIGLEC family of lectins.