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James T. MacGregor

D-Index & Metrics

Biology and Biochemistry

D-Index
60
Citations
13492
World Ranking
11913
National Ranking
5117

James T. MacGregor publication distribution in Biology and Biochemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Biology and Biochemistry in 2026. The highlighted bar marks where James T. MacGregor sits on this spectrum.

47–56 publications: 8 scientists 57–66 publications: 35 scientists 67–76 publications: 106 scientists 77–86 publications: 231 scientists 87–96 publications: 414 scientists 97–106 publications: 546 scientists 107–116 publications: 704 scientists 117–126 publications: 849 scientists 127–136 publications: 980 scientists 137–146 publications: 942 scientists 147–156 publications: 969 scientists 157–166 publications: 950 scientists 167–176 publications: 951 scientists 177–186 publications: 915 scientists 187–196 publications: 787 scientists 197–206 publications: 841 scientists 207–216 publications: 735 scientists 217–226 publications: 709 scientists 227–236 publications: 651 scientists 237–246 publications: 605 scientists 247–256 publications: 510 scientists 257–266 publications: 524 scientists 267–276 publications: 434 scientists 277–286 publications: 418 scientists 287–296 publications: 350 scientists 297–306 publications: 363 scientists 307–316 publications: 315 scientists 317–326 publications: 296 scientists 327–336 publications: 261 scientists 337–346 publications: 240 scientists 347–356 publications: 219 scientists 357–366 publications: 197 scientists 367–376 publications: 154 scientists 377–386 publications: 161 scientists 387–396 publications: 155 scientists 397–406 publications: 145 scientists 407–416 publications: 124 scientists 417–426 publications: 112 scientists 427–436 publications: 132 scientists 437–446 publications: 116 scientists 447–456 publications: 99 scientists 457–466 publications: 81 scientists 467–476 publications: 91 scientists 477–486 publications: 80 scientists 487–496 publications: 80 scientists 497–506 publications: 60 scientists 507–516 publications: 36 scientists 517–526 publications: 46 scientists 527–536 publications: 54 scientists 537–546 publications: 44 scientists 547–556 publications: 43 scientists 557–566 publications: 43 scientists 567–576 publications: 42 scientists 577–586 publications: 25 scientists 587–596 publications: 34 scientists 597–606 publications: 23 scientists 607–616 publications: 33 scientists 617–626 publications: 31 scientists 627–636 publications: 27 scientists 637–646 publications: 25 scientists 647–656 publications: 28 scientists 657–666 publications: 34 scientists 667–676 publications: 18 scientists 677–686 publications: 16 scientists 687–696 publications: 10 scientists 697–706 publications: 12 scientists 707–716 publications: 21 scientists 717–726 publications: 12 scientists 727–736 publications: 12 scientists 737–746 publications: 10 scientists 747–756 publications: 7 scientists 757–766 publications: 13 scientists 767–776 publications: 15 scientists 777–786 publications: 13 scientists 787–796 publications: 9 scientists 797–806 publications: 9 scientists 807–816 publications: 7 scientists 817–826 publications: 4 scientists 827–836 publications: 9 scientists 837–846 publications: 7 scientists 847–856 publications: 3 scientists 857–866 publications: 5 scientists 867–876 publications: 5 scientists 877–886 publications: 11 scientists 887–896 publications: 3 scientists 897–906 publications: 4 scientists 907–916 publications: 7 scientists 917–926 publications: 5 scientists 927–936 publications: 6 scientists 937–946 publications: 6 scientists 947–956 publications: 3 scientists 957–966 publications: 7 scientists 967–976 publications: 2 scientists 977–986 publications: 2 scientists 987–996 publications: 1 scientists 997–1,006 publications: 5 scientists 1,007–1,016 publications: 2 scientists 1,017–1,026 publications: 2 scientists 1,027 publications: 1 scientists 1,028+ publications: 100 scientists
47 publications 1,028+

This scientist: 145 publications — 24th percentile

24% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,028 publications or more.

James T. MacGregor D-index placement in Biology and Biochemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Biology and Biochemistry scientists ranked by Research.com in 2026. The highlighted bar marks where James T. MacGregor sits on this spectrum.

40–41 D-Index: 80 scientists 42–43 D-Index: 183 scientists 44–45 D-Index: 317 scientists 46–47 D-Index: 504 scientists 48–49 D-Index: 718 scientists 50–51 D-Index: 900 scientists 52–53 D-Index: 1,026 scientists 54–55 D-Index: 1,150 scientists 56–57 D-Index: 1,236 scientists 58–59 D-Index: 1,253 scientists 60–61 D-Index: 1,163 scientists 62–63 D-Index: 1,131 scientists 64–65 D-Index: 1,032 scientists 66–67 D-Index: 897 scientists 68–69 D-Index: 814 scientists 70–71 D-Index: 715 scientists 72–73 D-Index: 709 scientists 74–75 D-Index: 596 scientists 76–77 D-Index: 512 scientists 78–79 D-Index: 473 scientists 80–81 D-Index: 412 scientists 82–83 D-Index: 373 scientists 84–85 D-Index: 358 scientists 86–87 D-Index: 285 scientists 88–89 D-Index: 273 scientists 90–91 D-Index: 227 scientists 92–93 D-Index: 208 scientists 94–95 D-Index: 193 scientists 96–97 D-Index: 153 scientists 98–99 D-Index: 157 scientists 100–101 D-Index: 148 scientists 102–103 D-Index: 120 scientists 104–105 D-Index: 113 scientists 106–107 D-Index: 100 scientists 108–109 D-Index: 86 scientists 110–111 D-Index: 67 scientists 112–113 D-Index: 72 scientists 114–115 D-Index: 73 scientists 116–117 D-Index: 64 scientists 118–119 D-Index: 53 scientists 120–121 D-Index: 60 scientists 122–123 D-Index: 54 scientists 124–125 D-Index: 43 scientists 126–127 D-Index: 38 scientists 128–129 D-Index: 49 scientists 130–131 D-Index: 26 scientists 132–133 D-Index: 18 scientists 134–135 D-Index: 23 scientists 136–137 D-Index: 32 scientists 138–139 D-Index: 32 scientists 140–141 D-Index: 27 scientists 142–143 D-Index: 19 scientists 144–145 D-Index: 22 scientists 146–147 D-Index: 12 scientists 148–149 D-Index: 16 scientists 150–151 D-Index: 14 scientists 152–153 D-Index: 10 scientists 154–155 D-Index: 13 scientists 156–157 D-Index: 10 scientists 158–159 D-Index: 7 scientists 160–161 D-Index: 9 scientists 162–163 D-Index: 13 scientists 164–165 D-Index: 4 scientists 166 D-Index: 4 scientists 167+ D-Index: 98 scientists
40 D-Index 167+

This scientist: 60 D-Index — 41st percentile

41% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 167 D-Index or more.

Research.com Recognitions

  • 1982 - Fellow of the Royal Society of Canada Academy of Science

Overview

James T. MacGregor is affiliated with the United States Food and Drug Administration in the United States. Their research primarily focuses on the fields of Biochemistry, Genetics and Molecular Biology, and Medicine. Within these areas, their work spans several subfields including Molecular Biology, Genetics, Public Health, Environmental and Occupational Health, Health, Toxicology and Mutagenesis, and Cancer Research.

The main topics addressed in MacGregor's research include:

  • Carcinogens and Genotoxicity Assessment
  • Inflammatory Bowel Disease
  • Acute Lymphoblastic Leukemia research
  • Helicobacter pylori-related gastroenterology studies
  • Chromium effects and bioremediation
  • Environmental remediation with nanomaterials
  • Recycling and Waste Management Techniques

Their recent publications contribute to various scientific journals and cover multiple aspects of genetic and environmental toxicology.

Recent papers include:

  • "Human blood PIG-A mutation and micronucleated reticulocyte flow cytometric assays: Method optimization and evaluation of intra- and inter-subject variation," 2020, Environmental and Molecular Mutagenesis
  • "Assessment of systemic genetic damage in pediatric inflammatory bowel disease," 2020, Environmental and Molecular Mutagenesis
  • "Bruce Nathan Ames - Paradigm shifts inside the cancer research revolution," 2020, Mutation Research/Reviews in Mutation Research
  • "A review of mammalianin vivo genotoxicity of hexavalent chromium: implications for oral carcinogenicity risk assessment," 2021, Critical Reviews in Toxicology
  • "Lack of hydroxyurea-associated mutagenesis in pediatric sickle cell disease patients," 2023, Environmental and Molecular Mutagenesis

Their frequent co-authors include:

  • Svetlana L. Avlasevich
  • Dorothea K. Torous
  • Jeffrey C. Bemis
  • Stephen D. Dertinger
  • Errol Zeiger

MacGregor's research often appears in journals such as Environmental and Molecular Mutagenesis (with three publications), Critical Reviews in Toxicology, Food and Chemical Toxicology, Mutation Research/Reviews in Mutation Research, and Toxicology Letters.

In recognition of contributions to science, James T. MacGregor was awarded the title of Fellow of the Royal Society of Canada in 1982 by the Academy of Science.

Best Publications

  • Folate deficiency causes uracil misincorporation into human DNA and chromosome breakage: Implications for cancer and neuronal damage

    Benjamin C. Blount;Matthew M. Mack;Carol M. Wehr;James T. MacGregor

  • The induction of micronuclei as a measure of genotoxicity: A report of the U.S. environmental protection agency Gene-Tox program☆

    John A. Heddle;Mark Hite;Barbara Kirkhart;Kathleen Mavournin

  • Micronuclei as an index of cytogenetic damage: Past, present, and future

    J. A. Heddle;M. C. Cimino;M. Hayashi;F. Romagna

  • Toxicology and genetic toxicology in the new era of "toxicogenomics": impact of "-omics" technologies.

    Marilyn J. Aardema;James T. MacGregor

  • Guidelines for the conduct of micronucleus assays in mammalian bone marrow erythrocytes.

    James T. MacGregor;John A. Heddle;Mark Hite;Barry H. Margolin

  • In vivo rodent erythrocyte micronucleus assay.

    Makoto Hayashi;Raymond R. Tice;James T. MacGregor;Diana Anderson

  • Mutagenicity of plant flavonoids: structural requirements for mutagenic activity in Salmonella typhimurium.

    James T. Macgregor;Leonard Jurd

  • Clastogen-induced micronuclei in peripheral blood erythrocytes: The basis of an improved micronucleus test

    James T. MacGregor;Carol M. Wehr;Daniel H. Gould

  • In vivo rodent erythrocyte micronucleus assay. II. Some aspects of protocol design including repeated treatments, integration with toxicity testing, and automated scoring.

    Makoto Hayashi;James T. MacGregor;David G. Gatehouse;Ilse-Dore Adler

  • Trivalent Chromium: Assessing the Genotoxic Risk of an Essential Trace Element and Widely Used Human and Animal Nutritional Supplement

    David A. Eastmond;James T. MacGregor;Ronald S. Slesinski

  • The in vivo erythrocyte micronucleus test: measurement at steady state increases assay efficiency and permits integration with toxicity studies.

    James T. Macgregor;Carol M. Wehr;Philip R. Henika;Michael D. Shelby

  • Serum Troponins as Biomarkers of Drug-Induced Cardiac Toxicity

    Kendall B. Wallace;Elizabeth Hausner;Eugene Herman;Eugene Herman;Gordon D. Holt

  • The persistence of micronuclei in peripheral blood erythrocytes: detection of chronic chromosome breakage in mice

    Robert Schlegel;Robert Schlegel;James T. MacGregor;James T. MacGregor

  • Strategy for genotoxicity testing: hazard identification and risk assessment in relation to in vitro testing

    V. Thybaud;M. Aardema;J. Clements;K. Dearfield

  • In vivo erythrocyte micronucleus assay III. Validation and regulatory acceptance of automated scoring and the use of rat peripheral blood reticulocytes, with discussion of non-hematopoietic target cells and a single dose-level limit test.

    Makoto Hayashi;James T MacGregor;David G Gatehouse;David H Blakey

  • Association of Marginal Folate Depletion With Increased Human Chromosomal Damage In Vivo: Demonstration by Analysis of Micronucleated Erythrocytes

    Richard B. Everson;Carol M. Wehr;Gregory L Erexson;James T. MacGregor

  • 'Spontaneous' genetic damage in man: evaluation of interindividual variability, relationship among markers of damage, and influence of nutritional status.

    James T MacGregor;Carol M Wehr;Robert A Hiatt;Beverly Peters

  • The persistence of micronucleated erythrocytes in the peripheral circulation of normal and splenectomized Fischer 344 rats: implications for cytogenetic screening.

    Robert Schlegel;Robert Schlegel;James T. MacGregor;James T. MacGregor

  • Genetic effects of the flavonols quercetin, kaempferol, and galangin on Chinese hamster ovary cells in vitro.

    J.H. Carver;A.V. Carrano;J.T. MacGregor

  • Induction of hepatic mutations in lacI transgenic mice

    Jon C. Mirsalis;G.Scott Provost;Crystal D. Matthews;Richard T. Hamner

Frequent Co-Authors

Stephen D. Dertinger
Stephen D. Dertinger University of Rochester
Makoto Hayashi
Makoto Hayashi makoto international consulting
David Kirkland
David Kirkland Covance (United States)
James D. Tucker
James D. Tucker Wayne State University
Mendel Friedman
Mendel Friedman United States Department of Agriculture
Michael D. Shelby
Michael D. Shelby National Institutes of Health
Marilyn J. Aardema
Marilyn J. Aardema Procter & Gamble (United States)
Martha M. Moore
Martha M. Moore National Center for Toxicological Research
Bruce N. Ames
Bruce N. Ames University of California, Berkeley
Errol Zeiger
Errol Zeiger National Institutes of Health

External Links

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Best Scientists Citing James T. MacGregor

Stephen D. Dertinger

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Publications: 77

Michael Fenech

Michael Fenech

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University of California, Berkeley

Publications: 50

Robert H. Heflich

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United States Food and Drug Administration

Publications: 42

Patrick J. Stover

Patrick J. Stover

Texas A&M University

Publications: 41

Carole L. Yauk

Carole L. Yauk

University of Ottawa

Publications: 27

Makoto Hayashi

Makoto Hayashi

makoto international consulting

Publications: 27

David Kirkland

David Kirkland

Covance (United States)

Publications: 26

Mendel Friedman

Mendel Friedman

United States Department of Agriculture

Publications: 26

Walter C. Willett

Walter C. Willett

Harvard University

Publications: 20

John Ashby

John Ashby

Syngenta (Switzerland)

Publications: 19

Sang-Woon Choi

Sang-Woon Choi

Tufts University

Publications: 19

Martha M. Moore

Martha M. Moore

National Center for Toxicological Research

Publications: 18

Marilyn J. Aardema

Marilyn J. Aardema

Procter & Gamble (United States)

Publications: 18

Ivonne M.C.M. Rietjens

Ivonne M.C.M. Rietjens

Wageningen University & Research

Publications: 18

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Micheline Kirsch-Volders

Vrije Universiteit Brussel

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