A protein domain is a part of protein sequence and structure that can evolve , function, and exist independently of the rest of the protein chain.

This category includes articles about structural domains that can be found in families of evolutionary related proteins , as defined for example in Pfam or SCOP databases.

The protein kinase A consists of two domains, a small domain with several ? sheet structures, and ... Retrieved from " http://nostalgia.wikipedia.org/wiki/Protein_kinase " This page was ...

... integral membrane proteins that possess seven membrane-spanning domains or ... GPCR Database; G Protein-Coupled Receptor Database (GPCRDB) MeSH G-protein-coupled+receptors; Wikipedia:

The folding of small alpha-helical protein domains such as the villin headpiece and ... Retrieved from " http://en.wikipedia.org/wiki/Protein"