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PreMEDLINE (PREM), the National Library of Medicine's (NLM) in-process database for MEDLINE, provides basic information and abstracts before a record is indexed with MeSH heading(s) and added to MEDLINE. PreMEDLINE, like MEDLINE itself, encompassesinformation from Index Medicus, Index to Dental Literature, and International Nursing, as well as other sources of coverage in the areas of allied health, biological and physical sciences, humanities and information science (as they relate to medicine and health care, communication disorders, population biology, and reproductive biology). New records are added daily* to PreMEDLINE, appearing when the content of the record meets the scope of the PreMEDLINE database. After MeSH terms, publication types, GenBank accession numbers, and other indexing data are incorporated into a PreMEDLINE record; the completed citation is added to MEDLINE. Completed PreMEDLINE records are added as citations to MEDLINE on a weekly basis.