Bullae are rounded or irregularly shaped blisters containing serous or seropurulent fluid.They differ from vesicles only in size, being larger than 1 cm.
Toxoplasmosis ophthalmopathy is mainly characterzied by congenital malformation from optic pit and optic vesicle s lesion at earlier embryo period,and retinochoroiditis from inflammation.
Clathrin-coated pits and vesicles Both endocytosis of material at the plasma membrane and exocytosis from the Golgi apparatus involve the formation of clathrin-coated pits and vesicles.
The process involves extension and invagination of the plasma membrane to form small vesicles in pinocytosis (pinocytotic vesicles) or vacuoles in phagocytosis (food vacuoles).