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lüll Cell-cell membrane fusion during mammalian fertilization Primakoff P; Myles DGFEBS Lett 2007[May]; 581 (11): 2174-80The mechanism of sperm-egg fusion in mammals is a research area that has greatly benefited from the use of gene deletion technology. Because fertilization is internal in mammals and the gametes (particularly the eggs) are sparse in number, in vitro studies have considerable limitations. Using gene deletions, a few cell surface proteins in both gametes have been identified as essential for gamete fusion. Ongoing studies are directed at analysis of the function of these proteins and the search for additional proteins that may be involved in this process. So far, no mammalian proteins have been found that also function in sperm-egg fusion of non-mammalian species or in other types of cell-cell fusion.|*Fertilization[MESH]|Animals[MESH]|Female[MESH]|Gene Deletion[MESH]|Male[MESH]|Membrane Fusion/*physiology[MESH]|Models, Biological[MESH]|Ovum/metabolism/ultrastructure[MESH]|Sperm-Ovum Interactions/*physiology[MESH]|Spermatozoa/metabolism/ultrastructure[MESH] |