Research methods
PubMed Evidence Grades and Research-Use Interpretation
How Atlas separates human studies, animal models, cell work, reviews, and metadata-only records in its research database.
A citation is not a claim
PubMed indexing helps confirm that a publication exists, but it does not make the strongest possible interpretation true. The study design still determines the claim boundary.
Atlas separates human randomized studies, observational work, animal studies, in vitro records, reviews, and metadata-verified entries because they answer different questions.
Extraction depth matters
A metadata-verified record can support navigation and bibliography building. An abstract-extracted record can support a more detailed summary of population, intervention, endpoint, finding, and limitation. Full-text review can go deeper again.
Readers should treat extraction status as a confidence signal about the page summary, not as proof that the underlying finding is broadly generalizable.
Why species stays visible
Animal and cell studies can be valuable for mechanism generation, but they should not be merged with human outcome evidence. Keeping species visible prevents a common SEO problem: pages that rank by overclaiming beyond the study model.
Atlas research pages therefore preserve species, study type, endpoint, and limitation language even when a simpler claim would be easier to market.
Frequently asked questions
Does PubMed indexing prove a finding?
No. PubMed indexing confirms that a record exists in the indexed literature, but study design, species, endpoint, comparator, and extraction depth define the interpretation boundary.
Why separate animal and human evidence?
Animal, cell, review, and human studies answer different questions. Combining them into one claim can overstate what the evidence supports.
What does metadata-verified mean?
Metadata-verified means the bibliographic record has been mapped for navigation, but it should not be treated the same as a full abstract or full-text extraction.
Sources and further reading
- 01Open source
Semax literature index
PubMed, U.S. National Library of Medicine · Database
- 02Open source
Selank literature index
PubMed, U.S. National Library of Medicine · Database
- 03Open source
Thymosin alpha 1 literature index
PubMed, U.S. National Library of Medicine · Database
- 04Open source
MOTS-c literature index
PubMed, U.S. National Library of Medicine · Database