| | Cluster | Number of MeSH term/MeSH subheadings | | Cluster analysis |
| | 0 | 3,9,19,42,50,7,54,46,25,12,20 | 1. | Etiology of DN | | | 2. | Diagnosis of DN | | | 3. | Blood and urinary markers of DN | | 1 | 39,29,15,1,44,52,37,14,5,18,6,31,40 | 1. | Drugs treat DN by signal transduction or oxidative stress | | | 2. | Some plants extract drugs to treat DN | | | 3. | Hypoglycemic drugs for DN | | 2 | 47,16,38,21,53,32,4,35,55 | 1. | Single gene polymorphism of DN | | | 2. | MCs in DN pathology | | | 3. | Podocytes in DN pathology | | 3 | 13,48,17,43,10,27,30,8,26,41 | 1. | Treatment of DN | | | 2. | Epidemiology of the DN | | | 3. | Pathophysiology of the DN | | 4 | 51,24,36,11,22,23,28,2,33,49,34,45 | 1. | MicroRNAs in DN | | | 2. | Signal transduction in DN |
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