Medical Missiles: Homing in on Disease
Such lifesaving drugs as penicillin were discovered by accident, and no one knew at first how or why they worked. But today this ignorance may, for the most part, be a thing of the past. With increased knowledge of how the body fights disease, scientists are able to design drugs that work in ways similar to those of the body’s natural defenses. These “target drugs” home in on invading organisms and destroy them.

