Early Indus Valley Civilization ... their Geograhpy, their customs and Indo-Aryan civilization with the earliest caste system.
Antibodies contribute to immunity in three main ways: they can prevent pathogens from entering or damaging cells by binding to them; they can stimulate removal of a pathogen by macrophages and other cells by coating the pathogen; and they can trigger direct pathogen destruction by stimulating other immune responses such as the complement pathway.
When a vertebrate is infected with a virus, antibodies are produced against many epitopes on multiple virus proteins. A subset of these antibodies can block virus infection by a process that is called neutralization.Antibodies can neutralize viral infectivity in a number of ways, as summarized in the illustration.c portion â can bind to receptors on cells not normally infected by. the virus. The virus-antibody complex is taken up into cells, and. infection proceeds. I didn't answer the last part of your question â do viruses 'use' this. method of entering cells.