DOMAINS

domains: translation

(do-meīn\')

1. Compact, self-folding, structurally independent regions of proteins (usually around 100-300 amino acids in length); large proteins may have two or more domains connected by less structured stretches of polypeptide. In the antibody molecule, they are the loops, along with about 25 amino acids on each side, that form compact, globular sections.

2. The primary taxonomic groups above the kingdom level; all living organisms may be placed in one of three domains.