Cell–cell fusogens are proteins or molecules that promote the fusion of two adjacent cells, allowing their membranes to merge and ultimately leading to the formation of a single cell or a multinucleated structure. This process is crucial for various biological functions, including tissue development, immune responses, and viral infections. Fusogens can be found in many organisms, including viruses, where they play a key role in facilitating the entry of viral particles into host cells.
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