{
 "approved_by_author": "\u2705",
 "citation": "Lee, Y., et al. \u201cPlacental epigenetic clocks: estimating gestational age using placental DNA methylation levels.\u201d Aging 11(12): 4238\u20134253 (2019).",
 "citations": 172,
 "citations_date": "2026-10-02",
 "clock_name": "leecontrol",
 "data_type": "DNA methylation",
 "doi": "https://doi.org/10.18632/aging.102049",
 "journal": "Aging",
 "last_author": "Steve Horvath",
 "model_type": "elastic net regression",
 "n_features": 546,
 "notes": "Control placental clock trained on placentas designated as controls, with known major placental pathology excluded.",
 "platform": [
  "Illumina 450K",
  "Illumina EPIC"
 ],
 "population": "pregnancies",
 "predicts": [
  "gestational age"
 ],
 "research_only": null,
 "species": "Homo sapiens",
 "tissue": [
  "placenta"
 ],
 "training_target": [
  "gestational age"
 ],
 "unit": [
  "weeks"
 ],
 "version": "0.5.7",
 "year": 2019
}