Wikipedia:

List of B codes for MeSH

The following is a list of the "B" codes for MeSH. It is a product of the United States National Library of Medicine.

Source for content is here. (File "2006 MeSH Trees".)

MeSH B01 --- animals

MeSH B01.050 --- animal population groups

MeSH B01.050.116 --- animals, domestic

MeSH B01.050.157 --- animals, inbred strains

MeSH B01.050.199 --- animals, laboratory

MeSH B01.050.282 --- animals, newborn

MeSH B01.050.284 --- animals, outbred strains

MeSH B01.050.286 --- animals, poisonous

MeSH B01.050.293 --- animals, suckling

MeSH B01.050.300 --- animals, wild

MeSH B01.050.448 --- animals, zoo

MeSH B01.050.530 --- chimera

MeSH B01.050.680 --- organisms, genetically modified

MeSH B01.150 --- chordata

MeSH B01.150.200 --- chordata, nonvertebrate

MeSH B01.150.900 --- vertebrates