Examlex
Men experience __________ in testosterone levels between the ages of 48 and 70.
Hemagglutinins
Proteins found on the surface of certain viruses, like influenza, that enable the virus to bind to and infect host cells.
Viral Surface
The exterior part of a virus particle that interacts with a host's cellular mechanisms, often through specific proteins or receptors.
Host Cell
A living cell in which a virus or parasite invades and multiplies, often causing harm to the host.
Sirenians
Aquatic, herbivorous mammals that include species such as manatees and dugongs, known for their slow-moving nature and paddle-like flippers.
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