prosthetic group

https://doi.org/10.1351/goldbook.P04893
The non-amino acid portion of a conjugated protein. Examples include @C01128@ such as flavines or @C01510@ as well as @L03571@ and @P04752@, which are the prosthetic groups of @L03575@ and @G02656@, respectively.
Source:
PAC, 1992, 64, 143. (Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)) on page 163 [Terms] [Paper]