The proteins mediate signal transduction events that play a role in the regulation of cell development , activation , growth and motility .
Most of these members are cell - surface proteins that are characterized by the presence of four hydrophobic domains .
The proteins mediate signal transduction events that play a role in the regulation of cell development , activation , growth and motility .
Most of these members are cell - surface proteins that are characterized by the presence of four hydrophobic domains .