{
  "id": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1",
  "concept": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n",
  "url": "https://datasetpapers.com/papers/modern-collagen-cn-fish-vs-mammal-glycine/",
  "title": "Modern collagen atomic C:N differs between fish and mammals and tracks glycine content",
  "source_dataset": {
    "title": "Quality_control_for_modern_bone_collagen_stable_carbon_and_nitrogen_isotope_measurements",
    "doi": "10.5061/dryad.ffbg79crm",
    "license": "Creative Commons Zero v1.0 Universal"
  },
  "verification": {
    "method": "re_execution",
    "status": "matched",
    "reproduced": true,
    "ran_at": "2026-07-11T22:56:14Z",
    "record": "verification.json"
  },
  "gate": {
    "passed": true,
    "version": "gate-0.1",
    "novelty_grade": "B",
    "failed": []
  },
  "claims": [
    {
      "id": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/claim-1",
      "n": 1,
      "triple": {
        "subject": "modern collagen atomic C:N ratio",
        "predicate": "is lower in",
        "object": "ray-finned fish (Actinopterygii) than in mammals (Mammalia)"
      },
      "assertion_text": "In a compilation of modern vertebrate collagen (n=436), atomic C:N was lower in Actinopterygii (n=290, median 3.16, IQR 3.12-3.20) than in Mammalia (n=86, median 3.22, IQR 3.183-3.24); Mann-Whitney U=4946, p=1.68e-17, Hodges-Lehmann shift -0.060 (95% CI -0.070 to -0.050), Cliff's delta -0.60 (large).",
      "novelty_grade": "C",
      "mode": "confirmatory",
      "confidence": 0.95,
      "self_reported_status": "unverified",
      "independent_reexecution": "matched",
      "entities": [],
      "relations": [
        {
          "predicate": "supportedByEvidence",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/fig-1"
        },
        {
          "predicate": "supportedByEvidence",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/tbl-1"
        },
        {
          "predicate": "supportedByEvidence",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/analysis"
        },
        {
          "predicate": "wasDerivedFrom",
          "target": "https://doi.org/10.5061/dryad.ffbg79crm"
        },
        {
          "predicate": "isPartOf",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1"
        }
      ]
    },
    {
      "id": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/claim-2",
      "n": 2,
      "triple": {
        "subject": "collagen atomic C:N ratio",
        "predicate": "is negatively associated with",
        "object": "glycine content (residues per 1000)"
      },
      "assertion_text": "Across all 436 samples, atomic C:N was negatively rank-correlated with glycine content (Spearman rho=-0.616, p=6.64e-47, n=436); the association held within each focal class (Actinopterygii rho=-0.630, p=1.64e-33, n=290; Mammalia rho=-0.475, p=3.91e-06, n=86).",
      "novelty_grade": "C",
      "mode": "confirmatory",
      "confidence": 0.9,
      "self_reported_status": "unverified",
      "independent_reexecution": "matched",
      "entities": [],
      "relations": [
        {
          "predicate": "supportedByEvidence",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/fig-2"
        },
        {
          "predicate": "supportedByEvidence",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/analysis"
        },
        {
          "predicate": "wasDerivedFrom",
          "target": "https://doi.org/10.5061/dryad.ffbg79crm"
        },
        {
          "predicate": "isPartOf",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1"
        }
      ]
    },
    {
      "id": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/claim-3",
      "n": 3,
      "triple": {
        "subject": "glycine",
        "predicate": "is the strongest negative correlate of",
        "object": "atomic C:N among 19 collagen amino acids under FDR control"
      },
      "assertion_text": "In an amino-acid-wide screen (19 residues, Benjamini-Hochberg FDR), glycine was the strongest negative correlate of atomic C:N (Spearman rho=-0.616, q=1.26e-45, n=436); 16 of 19 residues were FDR-significant (q<0.05), with imino acids proline and hydroxyproline among the strongest positive correlates.",
      "novelty_grade": "B",
      "mode": "exploratory",
      "confidence": 0.88,
      "self_reported_status": "unverified",
      "independent_reexecution": "matched",
      "entities": [],
      "relations": [
        {
          "predicate": "supportedByEvidence",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/fig-3"
        },
        {
          "predicate": "supportedByEvidence",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/tbl-2"
        },
        {
          "predicate": "supportedByEvidence",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/analysis"
        },
        {
          "predicate": "wasDerivedFrom",
          "target": "https://doi.org/10.5061/dryad.ffbg79crm"
        },
        {
          "predicate": "isPartOf",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1"
        }
      ]
    },
    {
      "id": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/claim-4",
      "n": 4,
      "triple": {
        "subject": "the fish-lower-than-mammal C:N difference",
        "predicate": "is robust to",
        "object": "source-batch stratification, species-level pseudoreplication, and broadened class grouping"
      },
      "assertion_text": "The direction and significance of the fish<mammal C:N contrast were preserved across all robustness variants: within-source strata (Material=1: HL -0.050, p=8.72e-06; Material=3: HL -0.060, p=6.34e-13), taxon-collapsed to one median row per named species with unnamed rows kept individual (n=142 vs 23; HL -0.060, 95% CI -0.080 to -0.050, Cliff's delta -0.74, p=1.27e-08), and broadened groups fish+elasmobranchs vs mammals+birds (HL -0.060, p=3.81e-18).",
      "novelty_grade": "C",
      "mode": "confirmatory",
      "confidence": 0.92,
      "self_reported_status": "unverified",
      "independent_reexecution": "matched",
      "entities": [],
      "relations": [
        {
          "predicate": "supportedByEvidence",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/fig-4"
        },
        {
          "predicate": "supportedByEvidence",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/tbl-3"
        },
        {
          "predicate": "supportedByEvidence",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/analysis"
        },
        {
          "predicate": "wasDerivedFrom",
          "target": "https://doi.org/10.5061/dryad.ffbg79crm"
        },
        {
          "predicate": "isPartOf",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1"
        }
      ]
    },
    {
      "id": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/claim-5",
      "n": 5,
      "triple": {
        "subject": "all 436 modern collagen samples in both focal classes",
        "predicate": "fall within",
        "object": "the conventional archaeological C:N acceptance window (2.9-3.6)"
      },
      "assertion_text": "Every sample in both focal classes lay inside the conventional archaeological QC window 2.9-3.6 (Actinopterygii 100%, Mammalia 100%), so the class difference in central tendency occurs entirely within the window the archaeological criterion would treat as uniformly acceptable; it is a systematic offset, not a pass/fail effect in this compilation.",
      "novelty_grade": "B",
      "mode": "confirmatory",
      "confidence": 0.9,
      "self_reported_status": "unverified",
      "independent_reexecution": "matched",
      "entities": [],
      "relations": [
        {
          "predicate": "supportedByEvidence",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/fig-1"
        },
        {
          "predicate": "supportedByEvidence",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/tbl-1"
        },
        {
          "predicate": "supportedByEvidence",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1/analysis"
        },
        {
          "predicate": "wasDerivedFrom",
          "target": "https://doi.org/10.5061/dryad.ffbg79crm"
        },
        {
          "predicate": "isPartOf",
          "target": "ark:/99999/dp-quality-control-for-modern-bone-collagen-stable-carbon-and-n.v1"
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      ]
    }
  ]
}