Databases

Bookshelf
A collection of biomedical books that can be searched online and that are linked to PubMed through research paper citations within the text. The collection includes biomedical textbooks and other scientific books as well as some genetic resources, such as OMIM (described below), and NCBI manuals.
Journals Database
Database providing information on journals that are cited in any of NCBI's Entrez databases, including PubMed. Journals can be searched using the journal title, MEDLINE or ISO abbreviation, ISSN, or the NLM Catalog ID.
MeSH Database
MeSH (Medical Subject Headings) is the U.S. National Library of Medicine's controlled vocabulary for indexing articles for MEDLINE/PubMed. MeSH terminology provides a consistent way to retrieve information that may use different terminology for the same concepts.
National Library of Medicine (NLM) Catalog
Bibliographic data for all the journals, books, audiovisuals, computer software, electronic resources and other materials that are in the library's holdings.
NCBI Website Search
A database of static NCBI web pages, documentation, and online tools. These pages include such content as specialized online sequence analysis tools, back issues of newsletters, legacy resource description pages, sample code, and other miscellaneous resources.
Online Mendelian Inheritance in Animals (OMIA)
Database of genes, inherited disorders and traits in animal species (other than human and mouse), with textual information and references, as well as links to relevant records from other NCBI databases, such as PubMed and Gene.
Online Mendelian Inheritance in Man (OMIM)
Catalog of human genes and genetic disorders, with links to associated literature references, sequence records, maps, and related databases.
PubMed
A database of citations and abstracts for biomedical literature from MEDLINE and additional life science journals. Links are provided when full text versions of the articles are available via PubMed Central (described below) or other websites.
PubMed Central
A digital archive of full-text biomedical and life sciences journal literature, including clinical medicine and public health.

Tools

E-Utilities
Tools that provide access to data within NCBI's Entrez system outside of the regular web query interface. They provide a method of automating Entrez tasks within software applications. Each utility performs a specialized retrieval task, and can be used simply by writing a specially formatted URL.
LinkOut
A service that allows third parties to link directly from PubMed and other Entrez database records to relevant web-accessible resources beyond the Entrez system. Examples of LinkOut resources include full-text publications, biological databases, consumer health information and research tools.
PubMed Clinical Queries
PubMed queries targeted to clinicians and health services researchers, including searching by clinical study category, finding systematic reviews, and searching medical genetics literature.

Downloads

MEDLINE (Leasing)
NLM leases MEDLINE/PubMed to U.S. individuals or organizations, to its formally recognized International MEDLARS Centers, and to non-U.S. individuals or organizations for internal research projects with no commercial citation search service.
National Library of Medicine (NLM) DTDs
A suite of tag sets for authoring and archiving journal articles as well as transferring journal articles from publishers to archives and between archives. There are four tag sets: Archiving and Interchange Tag Set - Created to enable an archive to capture as many of the structural and semantic components of existing printed and tagged journal material as conveniently as possible; Journal Publishing Tag Set - Optimized for archives that wish to regularize and control their content, not to accept the sequence and arrangement presented to them by any particular publisher; Article Authoring Tag Set - Designed for authoring new journal articles; NCBI Book Tag Set - Written specifically to describe volumes for the NCBI online libraries.
PubMed Central (PMC) Open-Access Subset
The PMC Open-Access Subset is a relatively small part of the total collection of articles in PMC. Whereas the majority of articles in PMC are subject to traditional copyright restrictions, these articles are protected by copyright, but are made available under a Creative Commons or similar license that generally allows more liberal redistribution and reuse than a traditional copyright. Please refer to the license statement in each article for specific terms of use.

Submissions

NIH Manuscript Submissions (NIHMS)
The NIH Manuscript Submission (NIHMS) System is used to submit manuscripts that arise from NIH funding to the PubMed Central digital archive (http://www.pubmedcentral.nih.gov/), in accordance with the NIH Public Access Policy and the law it implements. The law and Public Access Policy are intended to ensure that the public has access to the published results of NIH-funded research.