Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A polypeptide consisting of 76 amino acids and found in all eukaryotic cells, whose main cellular function is to tag other proteins that will undergo degradation.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun biochemistry A small polypeptide present in the cells of all eukaryotes; it plays a part in modifying and degrading proteins

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[ubiquit(ous) + –in.]

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