GQuery - Global Cross-database NCBI Search
Formerly known as Entrez: The Life Sciences Search Engine. GQuery searches 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.
GQuery searches in 40 National Center for Biotechnology Information (NCBI) databases simultaneously, including biomedical journal literature (PubMed), a nucleotide sequence database (GenBank), a protein sequence database, three-dimensional macromolecular structures, complete genome assemblies, population study data sets (PopSet), organisms in GenBank (Taxonomy), and Online Mendelian Inheritance in Man (OMIM).