This product is comprised of an anti-CD33 monoclonal antibody (Lintuzumab) labeled with iFluor 568. iFluor 568 is a orange-fluorescent dye and it's excitation/emission is 578/603 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.