Circulatory system
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Immune System<br />
Immunity<br />
Antibody<br />
1. Active immunization<br />
Antigen<br />
B-cell<br />
1.1 Vaccine<br />
Vaccines may contain weakened<br />
or dead microbes = Antigen<br />
https://www.huffingtonpost.com/2014/10/30/college-flu-shots_n_6054946.html<br />
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