- A specific region or amino acid sequence in a protein associated with a particular function or corresponding segment of DNA
Definition from: GeneReviews
from the University of Washington and the National Center for Biotechnology Information
- A discrete portion of a protein with its own function. The combination of domains in a single protein determines its overall function.
Definition from: Office of Rare Diseases
at the National Institutes of Health
Related discussion in the Handbook
See also Understanding Medical Terminology.