antibody

https://doi.org/10.1351/goldbook.A00384
A protein (@I02982@) produced by the immune system of an organism in response to exposure to a foreign molecule (@A00394@) and characterized by its specific binding to a site of that molecule (antigenic determinant or @E02171@).
Sources:
PAC, 1992, 64, 143. (Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)) on page 146 [Terms] [Paper]
PAC, 1993, 65, 2003. (Glossary for chemists of terms used in toxicology (IUPAC Recommendations 1993)) on page 2014 [Terms] [Paper]