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| Medical Subject Headings | |
| AN | ANNOTATION |
| DA | DATE OF ENTRY |
| DQ | DATE QUALIFIER ESTABLISHED |
| GM | GRATEFUL MED NOTE |
| HN | HISTORY NOTE |
| M## | BACKFILE POSTINGS |
| MR | MAJOR REVISION DATE |
| MS | MESH SCOPE NOTE |
| OL | ONLINE NOTE |
| QA | TOPICAL QUALIFIER ABBREVIATION |
| QE | QUALIFIER ENTRY VERSION |
| QS | QUALIFIER SORT VERSION |
| QT | QUALIFIER TYPE |
| QX | QUALIFIER CROSS REFERENCE |
| RECTYPE | RECORD TYPE [= RY in ELHILL MESH] |
| SH | SUBHEADING |
| TN | TREE NODE ALLOWED |
| UI | UNIQUE IDENTIFIER |
M## INCLUDES MED, M94, M90, M85, M80, M75, and M66 data elements.
Last updated: 17 May 2004
First published: 12 October 2001
Metadata| Permanence level: Permanence Not Guaranteed