That's because after eukaryotic cells string together the amino acids that make up a protein, they glycosylate it—decorating the protein with sugar molecules for added stability. However ...
The RAS superfamily of GTPases includes five major subfamilies of monomeric guanine nucleotide binding proteins (RAS, RHO, RAB, RAN and ARF), which possess GDP/GTP-binding and intrinsic GTPase ...