| ARD | age-related disease |
| DEG | differentially expressed gene |
| log2 value | log2-transformed gene expression fold change |
| PAG | periaqueductal gray matter |
| PAI | phylostratigraphic age index |
| PC1 (PC2) | major (minor) principal component |
| qPCR | quantitative polymerase chain reaction |
| RNA-Seq | RNA sequencing |
| SNP | single-nucleotide polymorphism |
| TBP | TATA-binding protein |
| WHO | World Health Organization |
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