31. In humans, transferrin consists of a polypeptide chain containing 679 amino acids and two carbohydrate chains. 32. Transferrin also has a transferrin iron-bound receptor; it is a disulfide-linked homodimer.33. Transferrin also has a transferrin iron-bound receptor; it is a disulfide-linked homodimer. 34. There is very high selectivity for transferrin receptors because they are over-expressed in cancer cells. 35. Additional methods of looking for occult blood are being explored, including transferrin dipstick and stool cytology. 36. A relatively small amount ( 3 4 mg ) circulates through the plasma, bound to transferrin . 37. In low-iron conditions, IRE-BPs allow the cell to keep producing transferrin receptors. 38. The serum proteins transferrin , fibronectin, and plasminogen are also known to bind IGFBP-3. 39. Thus, Bves is important for VAMP3-mediated vesicular transport underlying cell migration and transferrin recycling. 40. Tumor cells have a high requirement of iron, which results in a large concentrtion of transferrin .
