You can also click on the highlighted term to return you to the page on which the term can be found. Antibody - One of millions of blood proteins, produced by the immune system, that specifically recognizes a foreign substance and initiates its removal from the body.
Proteins are polymers of amino acids.
Conformational change - A change in the physical position of atoms in a molecule without changing the makeup of the molecule. Immune System - A system in mammals that recognizes and neutralizes either foreign substances or self substances that have been altered to appear foreign. Lymph nodes - Specialized tissue regions that act as filters for cells, bacteria, and other foreign matter. Opportunistic Infection - A disease which waits on favorable opportunities such as a lowered immune defense. Also called an amide linkage.