This pair of diagrams shows the difference between a patient's immune system with and without protection from antibodies against cocaine. In the unprotected immune system, the normal condition, cocaine molecules enter the bloodstream and then cross unimpeded from the blood into the brain. In the protected immune system, a series of vaccines has stimulated the patient's immune system to produce cocaine antibodies in the blood. They attach to most of the molecules of cocaine and prevent them from reaching the brain.
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