What's in PubMed?

• Over 22 million records representing articles in the biomedical literature and a small selection of items from the NCBI Books database.
• Most PubMed records are MEDLINE citations. 
• Other records include those in different stages of processing (including records provided directly from the journal publisher) but destined to be MEDLINE citations.
• A relatively small number of records that are included in PubMed but not selected for MEDLINE. 

What is MEDLINE?

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