Antibody

**Semantic type:** Amino Acid, Peptide, or Protein|Immunologic Factor

**Definition:** A type of protein made by B lymphocytes in response to a foreign substance (antigen). Each antibody only binds to a specific antigen, helping to destroy the antigen directly or by assisting white blood cells to destroy the antigen.

**Synonyms:** - Ab - Antibodies - antibody - antibody - antibody