| entrez_citmatch | Fetch pubmed ids matching specially formatted citation strings |
| entrez_dbs | List databases available from the NCBI |
| entrez_db_links | List available links for records from a given NCBI database |
| entrez_db_searchable | List available search fields for a given database |
| entrez_db_summary | Retrieve summary information about an NCBI database |
| entrez_fetch | Download data from NCBI databases |
| entrez_global_query | Find the number of records that match a given term across all NCBI Entrez databases |
| entrez_info | Get information about EUtils databases |
| entrez_link | Get links to datasets related to records from an NCBI database |
| entrez_post | Post IDs to Eutils for later use |
| entrez_search | Search the NCBI databases using EUtils |
| entrez_summary | Get summaries of objects in NCBI datasets from a unique ID |
| extract_from_esummary | Extract elements from a list of esummary records |
| linkout_urls | Extract URLs from an elink object |
| parse_pubmed_xml | Summarize an XML record from pubmed. |
| set_entrez_key | Set the ENTREZ_KEY variable to be used by all rentrez functions |