NCBI's Entrez Global Query

Simultaneously search multiple life sciences databases at the National Center for Biotechnology Information (NCBI), including PubMed and GenBank.  The results list the number of records in each database that match your query, and provides links to those records. The Global Query search page also acts as a short Entrez database directory since each database is briefly described (select the question mark icon next to each database).

Type of Information: 
Data and Statistics