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A small (76 amino acyl residues) protein found in all cells of higher organisms and one with a structure that has changed minimally during evolutionary history; involved in at least two processes; histone modification and intracellular protein breakdown.
Farlex Partner Medical Dictionary © Farlex 2012
A small protein found in all eukaryotic cells that attaches to other proteins, thereby regulating their activity or location or marking them for degradation.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
A small protein found in all cells of higher organisms; its structure has changed minimally during evolutionary history; involved in histone modification and intracellular protein breakdown.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
ubiquitinA small 76-residue protein found in all animal cells and known to have altered minimally throughout evolutionary history. Ubiquitin is linked by covalent bonds to proteins destined for destruction by PROTEASOMES.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
ubiquitina small PROTEIN, present in all eukaryotic cells (ubiquitous protein), containing a highly conserved sequence of 76 AMINO ACIDS, that is identical in a wide range of organisms including humans, fish and insects. Ubiquitin is involved in a number of cellular functions, such as protein degradation and modifications to CHROMATIN structure.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005