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publishers/providers full-text online publisher of information in url subscription/membership/fee required Elsevier Science
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aggregators free resource full-text online preference Europe PubMed Central
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gene/protein/disease-specific free resource BioCyc
gene/protein/disease-specific free resource Gene Ontology
protein interactions/pathways free resource IMEx Consortium
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consumer health free resource MedlinePlus Health Information
patent databases free resource The Lens - Patent Citations
supplemental materials free resource scite Smart Citations