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.

Protein kinases are a group of enzymes that possess a catalytic subunit which transfers the gamma phosphate from nucleotide triphosphates (often ATP) to one or more amino acid ...

A summary of the mRNA sequence representatives for a transcribed locus ... Comparison of sequences in UniGene with selected protein reference sequences.

... CDD: a Conserved Domain Database for protein classification." , Nucleic Acids Res.33 (D)192-196. Marchler-Bauer A, Bryant SH (2004), "CD-Search: protein domain ...