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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 Ovid Technologies, Inc.
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gene/protein/disease-specific free resource BioCyc
gene/protein/disease-specific free resource Gene Ontology
free resource NCI CPTAC Assay Portal
free resource SciCrunch