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    "story_id": "mp-2026-07-25-012",
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    "headline": "A Biobank Catches Evolution Between Generations",
    "slug": "a-biobank-catches-evolution-between-generations",
    "dek": "Age-stratified allele frequencies in more than 72,000 people revealed genetic variants that may still be under selection.",
    "summary": "Age-stratified allele frequencies in more than 72,000 people revealed genetic variants that may still be under selection.",
    "body_text": "Researchers analyzed Taiwan Biobank data from more than 72,000 Han Taiwanese participants, comparing allele frequencies across age groups to identify variants whose representation changes between generations. The American Journal of Human Genetics study found signals consistent with ongoing natural selection, including rare variants connected to disease traits. Cross-sectional age patterns can be influenced by population history and participation, so the framework needs confirmation in other cohorts.",
    "why_it_matters": "Age-stratified allele frequencies in more than 72,000 people revealed genetic variants that may still be under selection.",
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    "modified_at": "2026-07-25T09:00:00.000-04:00",
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    "tags": [
      "population genetics",
      "Taiwan Biobank",
      "natural selection"
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    {
      "source_id": "source-2026-07-25-012",
      "title": "Academia Sinica via EurekAlert: Selection in Taiwan Biobank",
      "publisher": "Academia Sinica via EurekAlert",
      "url": "https://www.eurekalert.org/news-releases/1137255",
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    "name": "The Machine Press",
    "url": "https://themachinepress.com",
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    "title": "A Biobank Catches Evolution Between Generations",
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