{
 "approved_by_author": "\u231b",
 "citation": "Lu, A. T., et al. \"Universal DNA methylation age across mammalian tissues.\" Nature Aging 3.9 (2023): 1144-1166.",
 "citations": 415,
 "citations_date": "2026-10-02",
 "clock_name": "mammalianskin2",
 "data_type": "DNA methylation",
 "doi": "https://doi.org/10.1038/s43587-023-00462-6",
 "journal": "Nature Aging",
 "last_author": "Steve Horvath",
 "model_type": "elastic net regression",
 "n_features": 2240,
 "notes": "Skin-specific universal clock 2 fits relative age and returns species-adjusted chronological age in years after the maximum-lifespan inverse transformation.",
 "platform": [
  "Horvath MammalMethylChip40"
 ],
 "population": "multiple mammalian species",
 "postprocess": "mammalian2",
 "predicts": [
  "chronological age"
 ],
 "reference_values": true,
 "research_only": null,
 "species": "multiple species",
 "tissue": [
  "skin"
 ],
 "training_target": [
  "relative age"
 ],
 "unit": [
  "years"
 ],
 "version": "0.5.7",
 "year": 2023
}