Description_x000D_ General description_x000D_ The Human CD200 (also known as OX-2) ELISA (Enzyme-Linked Immunosorbent Assay) kit is an in vitro enzyme-linked immunosorbent assay for the quantitative measurement of human CD200 in serum, plasma, cell culture supernatants and urine._x000D_ Immunogen_x000D_ Recombinant Human CD200_x000D_ Application_x000D_ For research use only. Not for use in diagnostic procedures._x000D_ Please refer to the attached General ELISA KIT Procedure (sandwich, competitive & Indirect ELISA)_x000D_ Biochem/physiol Actions_x000D_ CD antigen 200 (CD200) acts as an immunosuppressor and is involved in maintaining immune homeostasis. The gene is overexpressed in a number of human cancers. The protein supports tumor growth and invasion by suppressing anti-tumor immune responses. CD200 is considered as a biomarker in colon cancer and cutaneous squamous cell carcinoma. Deficiency of CD200 results in hyper-activation of macrophages and enhanced immune response to autoimmune disease._x000D_ Other Notes_x000D_ A sample Certificate of Analysis is available for this product._x000D_ Please type the word sample in the text box provided for lot number.