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    "story_id": "mp-2026-08-28-004",
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    "headline": "The Reaction Model Followed the Electrons",
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    "dek": "MAELLE represents chemical reactions as discrete flow through electron-occupation space instead of direct molecular graph edits.",
    "summary": "MAELLE represents chemical reactions as discrete flow through electron-occupation space instead of direct molecular graph edits.",
    "body_text": "The method uses a continuous-time Markov chain and optimal-transport paths to produce interpretable electron rearrangements without elementary-step annotations. Its authors report competitive USPTO-480K accuracy, stronger robustness on two out-of-distribution settings and the ability to recover plausible mechanisms and side products; those benchmark results are not laboratory validation of a proposed reaction.",
    "why_it_matters": "MAELLE represents chemical reactions as discrete flow through electron-occupation space instead of direct molecular graph edits.",
    "limitations": [
      "Its authors report competitive USPTO-480K accuracy, stronger robustness on two out-of-distribution settings and the ability to recover plausible mechanisms and side products; those benchmark results are not laboratory validation of a proposed reaction."
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    "first_published_at": "2026-08-28T09:00:00.000-04:00",
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        "qualification": "Its authors report competitive USPTO-480K accuracy, stronger robustness on two out-of-distribution settings and the ability to recover plausible mechanisms and side products; those benchmark results are not laboratory validation of a proposed reaction."
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    "tags": [
      "chemistry",
      "flow matching",
      "reaction prediction"
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  "sources": [
    {
      "source_id": "source-2026-08-28-004",
      "title": "arXiv preprint 2608.27429",
      "publisher": "arXiv",
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      "published_at": "2026-08-27T13:50:44.000-04:00",
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    "title": "The Reaction Model Followed the Electrons",
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