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    "headline": "Three Amino Acids Tune Red Against Green",
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    "dek": "Macaque cone-pigment structures found three substitutions account for nearly the full spectral shift between red and green sensitivity.",
    "summary": "Macaque cone-pigment structures found three substitutions account for nearly the full spectral shift between red and green sensitivity.",
    "body_text": "The Science study ties the shift mainly to electrostatic changes around the shared retinal molecule and identifies a membrane-facing opening that may aid fast pigment regeneration. Macaque pigments closely resemble human ones, but the structural result is not a treatment for color-vision deficiency.",
    "why_it_matters": "Macaque cone-pigment structures found three substitutions account for nearly the full spectral shift between red and green sensitivity.",
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      "source_id": "source-2026-07-28-020",
      "title": "Nagoya Institute of Technology via EurekAlert: Red-green cone pigment structures",
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    "title": "Three Amino Acids Tune Red Against Green",
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