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  "observation_id": 696,
  "peptide": "AGEDGHPGKPGRPGER",
  "proforma": "[Oxidation]^3?AGEDGHPGKPGRPGER",
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  "tissue": "Pancreas",
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  "flags": ""
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  "observation_id": 761,
  "peptide": "DGEAGAQGPPGPAGPAGER",
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  "tissue": "Pancreas",
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  "condition": "Pancreatic tumour",
  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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  "taxon_id": 9606,
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  "uberon_id": "UBERON:0002048",
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  "doi": "10.1002/pmic.200800495",
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  "proforma": "[Oxidation]^3?GEPGPTGLPGPPGER",
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  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
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  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
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  "peptide": "GEPGPVGVQGPPGPAGEEGKR",
  "proforma": "[Oxidation]^2?GEPGPVGVQGPPGPAGEEGKR",
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  "protein_name": "Collagen alpha-1(I) chain",
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  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
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  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
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  "protein_name": "Collagen alpha-1(I) chain",
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  "species": "Homo sapiens",
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  "doi": "10.1007/s00216-010-3554-6",
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  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 809,
  "peptide": "GEQGPAGPPGFQGLPGPSGPAGEVGKPGER",
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  "tissue": "Pancreas",
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  "status": "review",
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  "doi": "10.1007/s00216-010-3554-6",
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  "peptide": "GETGPAGPAGPVGPVGAR",
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  "doi": "10.1007/s00216-010-3554-6",
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 {
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 {
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 {
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  "observation_id": 823,
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  "species": "Homo sapiens",
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  "observation_id": 824,
  "peptide": "GLTGPIGPPGPAGAPGDKGESGPSGPAGPTGAR",
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  "protein_name": "Collagen alpha-1(I) chain",
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  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
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  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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  "observation_id": 829,
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  "protein_name": "Collagen alpha-2(I) chain",
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  "species": "Homo sapiens",
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  "tissue": "Pancreas",
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  "status": "approved",
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  "observation_id": 830,
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  "status": "approved",
  "flags": "reported_theoretical_differs"
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  "observation_id": 831,
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  "protein_name": "Collagen alpha-2(I) chain",
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  "species": "Homo sapiens",
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  "uberon_id": "UBERON:0001264",
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  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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  "observation_id": 832,
  "peptide": "GPPGAAGAPGPQGFQGPAGEPGEPGQTGPAGAR",
  "proforma": "[Oxidation]^4?GPPGAAGAPGPQGFQGPAGEPGEPGQTGPAGAR",
  "protein_accession": "P08123",
  "protein_name": "Collagen alpha-2(I) chain",
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  "ppm_error": 19.76,
  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Lung",
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  "condition": "",
  "doi": "10.1002/pmic.200800495",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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  "observation_id": 833,
  "peptide": "GPPGPMGPPGLAGPPGESGR",
  "proforma": "[Oxidation]^2?GPPGPMGPPGLAGPPGESGR",
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  "protein_name": "Collagen alpha-1(I) chain",
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  "ppm_error": -8.07,
  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
  "condition": "Pancreatic tumour",
  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 834,
  "peptide": "GPPGPMGPPGLAGPPGESGR",
  "proforma": "[Oxidation][Oxidation]^2?GPPGPMGPPGLAGPPGESGR",
  "protein_accession": "P02452",
  "protein_name": "Collagen alpha-1(I) chain",
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  "theoretical_mz": 1832.85957,
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  "species": "Homo sapiens",
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  "tissue": "Pancreas",
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  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 835,
  "peptide": "GPPGPMGPPGLAGPPGESGR",
  "proforma": "[Oxidation][Oxidation]^3?GPPGPMGPPGLAGPPGESGR",
  "protein_accession": "P02452",
  "protein_name": "Collagen alpha-1(I) chain",
  "measured_mz": 1848.85,
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  "theoretical_mz": 1848.85449,
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  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
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  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 836,
  "peptide": "GPPGSAGAPGKDGLNGLPGPIGPPGPR",
  "proforma": "[Oxidation]^4?GPPGSAGAPGKDGLNGLPGPIGPPGPR",
  "protein_accession": "P02452",
  "protein_name": "Collagen alpha-1(I) chain",
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  "species": "Homo sapiens",
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  "tissue": "Pancreas",
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  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 837,
  "peptide": "GPSGPQGPGGPPGPK",
  "proforma": "[Oxidation]?GPSGPQGPGGPPGPK",
  "protein_accession": "P02452",
  "protein_name": "Collagen alpha-1(I) chain",
  "measured_mz": 1302.63,
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  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
  "condition": "Pancreatic tumour",
  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 839,
  "peptide": "GSAGPPGATGFPGAAGR",
  "proforma": "[Oxidation]^2?GSAGPPGATGFPGAAGR",
  "protein_accession": "P02452",
  "protein_name": "Collagen alpha-1(I) chain",
  "measured_mz": 1459.711,
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  "theoretical_mz": 1459.69243,
  "ppm_error": 12.72,
  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Lung",
  "uberon_id": "UBERON:0002048",
  "condition": "",
  "doi": "10.1002/pmic.200800495",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 840,
  "peptide": "GSAGPPGATGFPGAAGR",
  "proforma": "[Oxidation]^2?GSAGPPGATGFPGAAGR",
  "protein_accession": "P02452",
  "protein_name": "Collagen alpha-1(I) chain",
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  "adduct": "H",
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  "ppm_error": -8.52,
  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
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  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 841,
  "peptide": "GSEGPQGVR",
  "proforma": "GSEGPQGVR",
  "protein_accession": "P02452",
  "protein_name": "Collagen alpha-1(I) chain",
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  "adduct": "H",
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  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
  "condition": "Pancreatic tumour",
  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": ""
 },
 {
  "observation_id": 842,
  "peptide": "GSEGPQGVR",
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  "protein_accession": "P02452",
  "protein_name": "Collagen alpha-1(I) chain",
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  "adduct": "H",
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  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
  "condition": "Pancreatic tumour",
  "doi": "10.1021/pr900522m",
  "status": "approved",
  "flags": ""
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 {
  "observation_id": 843,
  "peptide": "GSPGEAGRPGEAGLPGAK",
  "proforma": "[Oxidation]^3?GSPGEAGRPGEAGLPGAK",
  "protein_accession": "P02452",
  "protein_name": "Collagen alpha-1(I) chain",
  "measured_mz": 1655.78,
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  "adduct": "H",
  "theoretical_mz": 1655.79835,
  "ppm_error": -11.08,
  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
  "condition": "Pancreatic tumour",
  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 846,
  "peptide": "GVQGPPGPAGPR",
  "proforma": "[Oxidation]?GVQGPPGPAGPR",
  "protein_accession": "P02452",
  "protein_name": "Collagen alpha-1(I) chain",
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  "charge": 1,
  "adduct": "H",
  "theoretical_mz": 1105.57488,
  "ppm_error": 2.82,
  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Lung",
  "uberon_id": "UBERON:0002048",
  "condition": "",
  "doi": "10.1002/pmic.200800495",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 848,
  "peptide": "GVVGLPGQR",
  "proforma": "[Oxidation]?GVVGLPGQR",
  "protein_accession": "P02452",
  "protein_name": "Collagen alpha-1(I) chain",
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  "theoretical_mz": 898.51049,
  "ppm_error": -29.48,
  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Lung",
  "uberon_id": "UBERON:0002048",
  "condition": "",
  "doi": "10.1002/pmic.200800495",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 849,
  "peptide": "GVVGLPGQR",
  "proforma": "[Oxidation]?GVVGLPGQR",
  "protein_accession": "P02452",
  "protein_name": "Collagen alpha-1(I) chain",
  "measured_mz": 898.51,
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  "adduct": "H",
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  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
  "condition": "Pancreatic tumour",
  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 1050,
  "peptide": "NPARTCRDLR",
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  "theoretical_mz": 1217.61676,
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  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
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  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 1119,
  "peptide": "RGPNGEAGSAGPPGPPGLR",
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  "protein_accession": "P08123",
  "protein_name": "Collagen alpha-2(I) chain",
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  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
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  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 1303,
  "peptide": "TGHPGTVGPAGIR",
  "proforma": "[Oxidation]?TGHPGTVGPAGIR",
  "protein_accession": "P08123",
  "protein_name": "Collagen alpha-2(I) chain",
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  "charge": 1,
  "adduct": "H",
  "theoretical_mz": 1235.64911,
  "ppm_error": -15.47,
  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
  "condition": "Pancreatic tumour",
  "doi": "10.1021/pr900522m",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 1304,
  "peptide": "TGHPGTVGPAGIR",
  "proforma": "[Oxidation]?TGHPGTVGPAGIR",
  "protein_accession": "P08123",
  "protein_name": "Collagen alpha-2(I) chain",
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  "adduct": "H",
  "theoretical_mz": 1235.64911,
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  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
  "condition": "Pancreatic tumour",
  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 1307,
  "peptide": "TGPPGPSGISGPPGPPGPAGK",
  "proforma": "[Oxidation]^3?TGPPGPSGISGPPGPPGPAGK",
  "protein_accession": "P08123",
  "protein_name": "Collagen alpha-2(I) chain",
  "measured_mz": 1829.9,
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  "adduct": "H",
  "theoretical_mz": 1829.90282,
  "ppm_error": -1.54,
  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
  "condition": "Pancreatic tumour",
  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 1308,
  "peptide": "TGPPGPSGISGPPGPPGPAGK",
  "proforma": "[Oxidation]^4?TGPPGPSGISGPPGPPGPAGK",
  "protein_accession": "P08123",
  "protein_name": "Collagen alpha-2(I) chain",
  "measured_mz": 1845.91,
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  "adduct": "H",
  "theoretical_mz": 1845.89773,
  "ppm_error": 6.65,
  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
  "condition": "Pancreatic tumour",
  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
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 {
  "observation_id": 1347,
  "peptide": "VGPPGPSGNAGPPGPPGPAGK",
  "proforma": "[Oxidation]^3?VGPPGPSGNAGPPGPPGPAGK",
  "protein_accession": "P02452",
  "protein_name": "Collagen alpha-1(I) chain",
  "measured_mz": 1812.88,
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  "species": "Homo sapiens",
  "taxon_id": 9606,
  "tissue": "Pancreas",
  "uberon_id": "UBERON:0001264",
  "condition": "Pancreatic tumour",
  "doi": "10.1007/s00216-010-3554-6",
  "status": "approved",
  "flags": "reported_theoretical_differs"
 }
]