【简答题】Antibodies A vital ingredient that is a part of every person's immune system is its antibodies . They are large y-shaped proteins, also called immunoglobulins, found in the blood or other body fluids ...
【简答题】Vaccines When people are experiencing good health, it is due to an effective and working immune system. The immune system is responsible for keeping the body safe from invading germs that try to attac...
【单选题】Unlike many other retroviruses, HIV kills many of the cells it infects (principally _____________) rather than causing tumor formation. This gradually leads to suppression of the immune system in the ...