|Cell culture supernatants||98%||80%-111%|
Alpha-1B-glycoprotein (A1BG) is a plasma protein and is a member of the immunoglobulin superfamily. Alpha-1B-glycoprotein contains 474 amino acids and has 5 intrachain disulfide bonds. It has been reported that cysteine-rich secretory protein 3 (CRISP-3) is a specific and high-affinity ligand of alpha-1B-glycoprotein. Alpha-1B-glycoprotein-CRISP-3 complex displays a similar function in protecting the circulation from a potentially harmful effect of free CRISP3. Alpha-1B-glycoprotein is present in normal adult plasma at an average concentration of 22 mg/dl. Elevated alpha-1B-glycoprotein levels in blood have been associated with several kinds of cancer, including non-small cell lung cancer, endometrial and cervical cancer.