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mesh-terms-guide
Navigate MeSH vocabulary for precise PubMed and MEDLINE searches
skills/literature/search/mesh-terms-guide/SKILL.md
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# MeSH Terms Guide
A skill for using Medical Subject Headings (MeSH) to construct precise and comprehensive biomedical literature searches. Covers MeSH tree structure, subheadings, explosion, major topics, and strategies for combining MeSH with free-text terms.
## Understanding MeSH Vocabulary
### What Is MeSH?
MeSH is a hierarchical controlled vocabulary maintained by the National Library of Medicine. Every article indexed in MEDLINE/PubMed is assigned MeSH terms by trained indexers. Using MeSH ensures you capture articles that discuss a concept even when authors use different terminology.
### Tree Structure and Hierarchy
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MeSH terms are organized in a tree with up to 13 hierarchical levels.