Electrolytes enter and leave cells through proteins in the cell membrane called ion channels. The platelet cell membrane has receptors for collagen. Transport across the plasma membrane is likely tissue specific. These particles are surrounded by a lipid membrane derived from the host cell membrane. Affinity chromatography is one of the best solutions for purification of membrane proteins. This then results in the phosphorylation of several signaling proteins located in the cell membrane. Hemagglutinin and neuraminidase molecules cluster into a bulge in the cell membrane. It is accomplished via selective receptors on the luminal cell membrane. Some stimuli are physical variations in the environment that affect receptor cell membrane potentials. An inner nuclear membrane and an outer nuclear membrane. The vesicle membrane comes in contact with the plasma membrane. Stage two occurs in the cytoplasmic membrane. Myelin reduces the capacitance of the axonal membrane. A gelatinous capsule is present in some bacteria outside the cell membrane and cell wall. The strong oxidative effect leads to necrosis of the mucous membrane.