41. This hypothesis is based on meningeal mast cell activation. 42. Another common mast cell stabilizer that is used for treating allergic conjunctivitis is sodium cromoglicate. 43. Mast cells seem to have other roles as well.44. Other cells that show CD117 positivity are mast cells . 45. TSPO is present in mast cells and macrophages, indicating its role in the immune system. 46. The breed is particularly predisposed to mast cell tumours, a cancer of the immune system. 47. MAZR also plays a role in the phenotypic expression of mast cells in association with MITF. 48. Inside, it causes the immune system to produce Y-shaped antibodies that attach themselves to mast cells . 49. People have more mast cells in their respiratory tract; dogs have more mast cells their skin. 50. People have more mast cells in their respiratory tract; dogs have more mast cells their skin.