Complex sentence: Like other members of the Ras family, the KRAS protein is a GTPase and is an early player in many signal transduction pathways and is usually associated with cell membranes due to the presence of an isoprenyl group on its c-terminus.
Split into simpler sentences: Like other members of the Ras family, the KRAS protein is a GTPase and is an early player in many signal transduction pathways. KRAS is usually tethered to cell membranes due to the presence of an isoprenyl group on its C-terminus.