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publishers/providers full-text online publisher of information in url subscription/membership/fee required Nature Publishing Group
aggregators author manuscript free resource Europe PubMed Central
aggregators full-text online subscription/membership/fee required Hinari - Access to Research for Health programme
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clinical trials free resource ClinicalTrials.gov
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gene/protein/disease-specific free resource Gene Ontology
organism-specific free resource Mouse Genome Informatics (MGI)
free resource NCI CPTAC Assay Portal
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patent databases free resource The Lens - Patent Citations