31. Tat then crosses the plasma membrane to reach the extracellular space. 32. Collagen fibrillogenesis occurs in the plasma membrane during embryonic development. 33. Other functions likely include the maintenance of the plasma membrane and other metabolic pathways. 34. Synaptic vesicles are docked at the presynaptic plasma membrane at regions called active zones. 35. They accumulate asymmetrically to the plasma membrane at the leading edge of polarized cells. 36. Expression of the two subunits together leads to plasma membrane expression of functional receptor. 37. Plasma membranes appear discontinuous when viewed with an electron microscope.38. The apical plasma membrane projects microvilli to give an increased surface area for secretion. 39. The vesicle membrane comes in contact with the plasma membrane . 40. This phase has been related to lipid rafts that may exist in plasma membranes .
