Search across multiple Entrez-hosted databases from the National Library of Medicine. Entrez is NCBI’s primary text search and retrieval system that integrates the PubMed database of biomedical literature with 39 other literature and molecular databases including DNA and protein sequence, structure, gene, genome, genetic variation and gene expression.
More detailed help is available for the individual Entrez databases in the NCBI Help Manual sections on the NCBI bookshelf.
The Entrez search interface features powerful options for constructing precise searches and managing results. Options include popular configurable Limits and preset filters to help focus on specific kinds of results, an Advanced Search interface that facilitates constructing more sophisticated queries. Specialized search fields are available for each database and can be browsed and selected in the Search Builder section of the Advanced Search interface. Other useful Entrez features include Search History with access to recent results and a Clipboard where search results can be saved temporarily. A My NCBI account increases the power of the system by providing even more flexibility. Most importantly Entrez integrates data with links within and between databases. Not only does this interconnectivity enhance navigation and allow search results to be quickly focused or expanded; but also, more importantly, these relationships often expose unexpected connections that can lead to scientific discoveries
September 13, 2010