Figure 4.

Classification of proteins with closed covalent loop based on the minimal surface technique (left) and GLN technique (right). As much as 98% of structures are classified in an analogous way by both techniques (corresponding points are colored in the same way on both plots). However, on the right, plot types are divided more regularly since the corresponding classification is based only on the GLN values. To differenciate between the types ${\text{gL}}_{2+}$ and ${\text{gL}}_{3+}$ on the plots (green and red dots, respectively) one needs the third coordinate—whGLN value.