MeSH Tree Structures

 MeSH headings are organized in a "tree" with 16 main branches:

A. Anatomy
B. Organisms
C. Diseases
D. Chemical and Drugs
E. Analytical, Diagnostic and Therapeutic Techniques and Equipment
F. Psychiatry and Psychology
G. Phenomena and Processes
H. Disciplines and Occupations
I. Anthropology, Education, Sociology and Social Phenomena
J. Technology, Industry, Agriculture
K. Humanities
L. Information Science
M. Named Groups
N. Health Care
V. Publication Characteristics
Z. Geographicals

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