Purity ~95% (SDS-PAGE). SIGLEC9, also known as sialic acid-binding Ig-like lectin 9 isoform 1, is a novel member of the sialic acid-binding Ig-like lectin (Siglec) family, which belongs to the immunoglobulin superfamily (IgSF) expressed broadly on human blood leukocytes. It has a high-level expression in bone marrow, placenta, spleen, and fetal liver. It is a member of the recently characterized CD33-related Siglec family of sialic acid binding protein and is expressed on human monocytes and NK cells. Source: Recombinant protein corresponding to aa18-348 from human SIGLEC9, fused to hIgG-His-Tag at C-terminal, expressed in insect cell. Molecular Weight: ~63.3kD (573aa), 70-100kD (SDS-PAGE under reducing conditions) Endotoxin: <1EU/1ug (determined by LAL method) AA