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Medical Subject Headings

ASCII MeSH. Descriptor Data Elements

Descriptor records in ASCII MeSH contain the data elements listed below. The list includes all the descriptor data in ELHILL file MeSH, plus some additional information.* Note that not every record has every data element. Sample record.

AN ANNOTATION
AQ ALLOWABLE TOPICAL QUALIFIERS
CATSH CATALOGING SUBHEADINGS LIST NAME *
CX CONSIDER ALSO XREF
DA DATE OF ENTRY
DC DESCRIPTOR CLASS
DE DESCRIPTOR ENTRY VERSION
DS DESCRIPTOR SORT VERSION
DX DATE MAJOR DESCRIPTOR ESTABLISHED
EC ENTRY COMBINATION
PRINT ENTRY ENTRY TERM, PRINT **
ENTRY ENTRY TERM, NON-PRINT **
FX FORWARD CROSS REFERENCE (SEE ALSO REFERENCE)
GM GRATEFUL MED NOTE *
HN HISTORY NOTE
M## BACKFILE POSTINGS
MH MESH HEADING
MH_TH MESH HEADING THESAURUS ID [= MHTH in ELHILL MESH]
MN MESH TREE NUMBER
MR MAJOR REVISION DATE
MS MESH SCOPE NOTE
N1 CAS TYPE 1 NAME
OL ONLINE NOTE
PA PHARMACOLOGICAL ACTION
PI PREVIOUS INDEXING
PM PUBLIC MESH NOTE
PX PRE EXPLOSION
RECTYPE RECORD TYPE [= RY in ELHILL MESH ]
RH RUNNING HEAD, MESH TREE STRUCTURES
RN CAS REGISTRY/EC NUMBER
RR RELATED CAS REGISTRY NUMBER
ST SEMANTIC TYPE *
UI UNIQUE IDENTIFIER

* = not in ELHILL MeSH

M## INCLUDES MED, M94, M90, M85, M80, M75, and M66 data elements.

** ENTRY and PRINT ENTRY terms may have several subfields, with each subfield entry separated from another by a bar. A final string "map" indicates which value goes with which subfield. For example,

PRINT ENTRY = Avian Sarcoma|T050|T191|NON|EQV|NLM (1994)|930624|abbcdef

In the final string of characters - 'abcdeef' - each letter corresponds to a specific subfield and indicates the position of the subfield and any position repeats:

a the term itself
b SEMANTIC TYPE*
c LEXICAL TYPE*
d SEMANTIC RELATION*
e THESAURUS ID
f DATE
s SORT VERSION
v ENTRY VERSION

* = not in ELHILL MeSH