RAPGEF1 belongs to the adaptor-type Src homology whose domains are globular protein (chain of amino acids) modules and mediate binding events.
It belongs to the adaptor-type Src homology (SH)2-containing molecules. Src homology 2 domains are globular protein modules present in a large variety of functionally distinct proteins. They mediate binding events that control the activity and localization of many proteins involved in the transmission of signals from the cell surface to the nucleus. Proteins are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues. 
