Complement fixation is effective against cell membranes (456). Viruses lack cell membranes (picture on 450-note lack of lipid bilayer).
Histamine is important in marshalling your body's defenses against attack by germs. Among the many things it helps with is in making it easier for phagocytic cells to get to the site of an invasion (457). If histamine can no longer help to coordinate a counterattack, then the infection is likely to go forward in a more life-threatening way.
The cornea is hidden from the blood (467).
It can be used as an early sign to alert a physician that the man has prostate cancer (468).
Polysaccharides and proteins can serve as allergens (450). Since insects must continue to molt until adulthood, they serve as a good source for these potential allergens. The skins themselves are even more fragile than the insects themselves so they easily break up into tiny, more dangerous dust particles (474).
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