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One reason you may get more results in Meta than in PubMed is because Meta includes preprints from bioRxiv, medRxiv, q-bio, and other preprint servers, as well as a broad array of additional content types (please see What content is included in Meta?). Second, Meta uses machine learning to scan new biomedical articles, analyze and incorporate them into a dynamic map of biomedical concepts—every journal, researcher, disease, gene, protein, pathway, protocol and more. This allows Meta to capture much more information about a paper than keywords. Third, Meta may expand your search queries to include related concepts or terms, and therefore return more results.