Researchers have added fresh evidence that early exposure to vaccine-, bacterial- or microbiota-derived antigens has a dramatic effect on the diversity of antibodies an adult mammal will have to fight future infections by pathogens. This antibody diversity is called the clonal repertoire -- basically different single cells with distinct antibody potential that can multiply into a large clone of cells, all producing that distinct antibody.
from Health & Medicine News -- ScienceDaily https://www.sciencedaily.com/releases/2020/07/200709172852.htm
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