Table 1. MeSH groups and number of NCBI-GEO data sets in each group.
| MeSH Tree Number | MeSH Heading | Number of Sets |
| ALL | ALL | 381 |
| A10 | Tissues | 77 |
| A10.272 | Epithelium | 16 |
| A10.690 | Muscles | 46 |
| A11 | Cells | 223 |
| A11.118 | Blood Cells | 47 |
| A11.148 | Bone Marrow Cells | 14 |
| A11.251 | Cells. Cultured | 157 |
| A11.284 | Cellular Structures | 40 |
| A11.329 | Connective Tissue Cells | 34 |
| A11.436 | Epithelial Cells | 48 |
| A11.627 | Myeloid Cells | 17 |
| A11.733 | Phagocytes | 14 |
| A11.872 | Stem Cells | 22 |
| A15 | Hemic and Immune Systems | 74 |
| A15.145 | Blood | 51 |
| A15.378 | Hematopoietic System | 14 |
| A15.382 | Immune System | 60 |
| C04 | Neoplasms | 108 |
| C04.557 | Neoplasms by Histologic Type | 68 |
| C04.588 | Neoplasms by Site | 68 |
| C04.697 | Neoplastic Processes | 16 |