Ten most closely linked genes (HSPA1B, HSPB1, HSPA1A, DNAJB1, HSPB8, ANXA2, ANXA1, SOX9, YAP1 and AHNAK) in the network data were extracted and identified as the hub genes of AD using the huba algorithm of cytoscape software (Figure 6D). The gene discussed is HSPB1; the disease is Alzheimer disease.