![ubiquitin ubiquitin](https://www.tekportal.net/wp-content/uploads/2018/11/ubiquitin.jpg)
noun
- a small protein, present in all eukaryotic cells, that participates in the destruction of defective proteins and in the synthesis of new proteins.
noun
- biochem a small polypeptide, found in most eukaryotic cells, that combines with other proteins to make them susceptible to degradation
n.
- A polypeptide found in all eukaryotic cells, including plant cells, that participates in a variety of cellular functions including protein degradation.