Which membrane proteins act as cell markers, involved in cell signalling and endocytosis? Is it glycocalyx or other protein molecules in cell membrane?
Similar functions. Of course, each membrane protein has a different function than others, although they may be similar. Glycocalyx is a fuzzy layer of glycoproteins and sugar moieties located on the external side of the plasma membrane. In addition to cell signaling, glycocalyx has other important functions. Endocytosis is not one of the functions that it seems to be involved in, at least not in mammalian cells. In bacteria, it may prevent or hinder phagocytosis, however.