hapten

https://doi.org/10.1351/goldbook.H02738
A low-@M04000@ molecule which contains an antigenic determinant but which is not itself antigenic unless complexed with an antigenic @C00859@. Examples of haptens are dinitrophenols, phosphorylcholine and dextran.
Source:
PAC, 1992, 64, 143. (Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)) on page 156 [Terms] [Paper]