Proteins with proper structure are targeted to the Golgi and after the Golgi-specific modifications are sorted and transported to the different compartments or are secreted (Figure 3.8.). In the case of the ER proteins, the KDEL sequence is present at their C terminal regions help their recirculation to the ER. In the Golgi compartments the oligosaccharide chain of proteins is further modified (Figure 3.9.) giving rise to various sugar complexes (Figure 3.10.). The generated sugar is an important localization signal determining the protein targeting to different organelles.