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Search all of PubMed
Search PubMed Central, all results will be freely available articles
Europe PMC is a repository, providing access to worldwide life sciences articles, books, patents and clinical guidelines.
Databases from the National Library of Medicine on toxicology, hazardous chemicals, environmental health, and toxic releases. Databases link to PubMed Central open access content.
A free preprint service for the nutritional sciences
The open archive for sport-related research.
Search Google Scholar
Google Scholar searches the academic, scholarly Web for peer-reviewed papers, theses, books, abstracts and articles. If the item is freely available, you will often seen a PDF link on the right.