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".)

--- animals, inbred strains

 * --- animals, congenic
 * --- mice, congenic
 * --- mice, inbred strains
 * --- mice, inbred a
 * --- mice, inbred akr
 * --- mice, inbred balb c
 * --- mice, inbred c3h
 * --- mice, inbred c57bl
 * --- mice, inbred mdx
 * --- mice, inbred cba
 * --- mice, inbred cftr
 * --- mice, inbred dba
 * --- mice, inbred hrs
 * --- mice, inbred icr
 * --- mice, inbred mrl lpr
 * --- mice, inbred nod
 * --- mice, inbred nzb
 * --- mice, inbred sencar
 * --- rats, inbred strains
 * --- rats, inbred aci
 * --- rats, inbred bb
 * --- rats, inbred bn
 * --- rats, inbred buf
 * --- rats, inbred dahl
 * --- rats, inbred f344
 * --- rats, inbred lec
 * --- rats, inbred lew
 * --- rats, inbred oletf
 * --- rats, inbred shr
 * --- rats, inbred wf
 * --- rats, inbred wky

--- animals, laboratory

 * --- animals, congenic
 * --- mice, congenic
 * --- animals, inbred strains
 * --- animals, congenic
 * --- mice, congenic
 * --- mice, inbred strains
 * --- mice, inbred a
 * --- mice, inbred akr
 * --- mice, inbred balb c
 * --- mice, inbred c3h
 * --- mice, inbred c57bl
 * --- mice, inbred mdx
 * --- mice, inbred cba
 * --- mice, inbred cftr
 * --- mice, inbred dba
 * --- mice, inbred hrs
 * --- mice, inbred icr
 * --- mice, inbred mrl lpr
 * --- mice, inbred nod
 * --- mice, inbred nzb
 * --- mice, inbred sencar
 * --- rats, inbred strains
 * --- rats, inbred aci
 * --- rats, inbred bb
 * --- rats, inbred bn
 * --- rats, inbred buf
 * --- rats, inbred dahl
 * --- rats, inbred f344
 * --- rats, inbred lec
 * --- rats, inbred lew
 * --- rats, inbred oletf
 * --- rats, inbred shr
 * --- rats, inbred wf
 * --- rats, inbred wky

--- animals, poisonous

 * --- fishes, poisonous

--- chimera

 * --- transplantation chimera
 * --- radiation chimera

--- organisms, genetically modified

 * --- animals, genetically modified
 * --- mice, transgenic
 * --- mice, knockout

--- chordata, nonvertebrate

 * --- hyperotreti
 * --- hagfishes
 * --- urochordata
 * --- ciona intestinalis

--- vertebrates

 * --- amphibia
 * --- anura
 * --- bufonidae
 * --- bufo arenarum
 * --- bufo bufo
 * --- bufo marinus
 * --- pipidae
 * --- xenopus
 * --- xenopus laevis
 * --- ranidae
 * --- rana catesbeiana
 * --- rana esculenta
 * --- rana pipiens
 * --- rana ridibunda
 * --- rana temporaria
 * --- urodela
 * --- ambystomatidae
 * --- ambystoma
 * --- ambystoma mexicanum
 * --- proteidae
 * --- necturus
 * --- necturus maculosus
 * --- salamandridae
 * --- notophthalmus
 * --- notophthalmus viridescens
 * --- pleurodeles
 * --- salamandra
 * --- triturus
 * --- birds
 * --- anseriformes
 * --- ducks
 * --- geese
 * --- charadriiformes
 * --- columbiformes
 * --- columbidae
 * --- falconiformes
 * --- eagles
 * --- hawks
 * --- galliformes
 * --- chickens
 * --- quail
 * --- colinus
 * --- coturnix
 * --- turkeys
 * --- palaeognathae
 * --- dromaiidae
 * --- rheiformes
 * --- struthioniformes
 * --- poultry
 * --- chickens
 * --- ducks
 * --- geese
 * --- turkeys
 * --- passeriformes
 * --- songbirds
 * --- crows
 * --- finches
 * --- canaries
 * --- sparrows
 * --- starlings
 * --- swallows
 * --- psittaciformes
 * --- cockatoos
 * --- parrots
 * --- agapornis
 * --- amazona
 * --- parakeets
 * --- melopsittacus
 * --- psittacula
 * --- raptors
 * --- falconiformes
 * --- eagles
 * --- hawks
 * --- strigiformes
 * --- spheniscidae
 * --- strigiformes
 * --- fishes
 * --- batrachoidiformes
 * --- catfishes
 * --- ictaluridae
 * --- cypriniformes
 * --- cyprinidae
 * --- carps
 * --- goldfish
 * --- zebrafish
 * --- eels
 * --- anguilla
 * --- elasmobranchii
 * --- sharks
 * --- dogfish
 * --- squalus
 * --- squalus acanthias
 * --- skates (fish)
 * --- torpedo
 * --- electric fish
 * --- gymnotiformes
 * --- electrophorus
 * --- skates (fish)
 * --- torpedo
 * --- esociformes
 * --- esocidae
 * --- umbridae
 * --- fishes, poisonous
 * --- flatfishes
 * --- flounder
 * --- gadiformes
 * --- gadus morhua
 * --- hagfishes
 * --- lampreys
 * --- petromyzon
 * --- osmeriformes
 * --- perciformes
 * --- bass
 * --- cichlids
 * --- tilapia
 * --- perches
 * --- sea bream
 * --- tuna
 * --- salmoniformes
 * --- salmonidae
 * --- salmon
 * --- oncorhynchus
 * --- oncorhynchus keta
 * --- oncorhynchus kisutch
 * --- salmo salar
 * --- trout
 * --- oncorhynchus
 * --- oncorhynchus mykiss
 * --- smegmamorpha
 * --- beloniformes
 * --- oryzias
 * --- cyprinodontiformes
 * --- fundulidae
 * --- killifishes
 * --- poecilia
 * --- tetraodontiformes
 * --- takifugu
 * --- mammals
 * --- artiodactyla
 * --- ruminants
 * --- antelopes
 * --- bison
 * --- buffaloes
 * --- camelids, new world
 * --- camels
 * --- cattle
 * --- deer
 * --- muntjacs
 * --- reindeer
 * --- goats
 * --- rupicapra
 * --- sheep
 * --- sheep, bighorn
 * --- sheep, domestic
 * --- swine
 * --- sus scrofa
 * --- swine, miniature
 * --- carnivora
 * --- canidae
 * --- coyotes
 * --- dogs
 * --- foxes
 * --- jackals
 * --- raccoon dogs
 * --- wolves
 * --- felidae
 * --- acinonyx
 * --- felis
 * --- cats
 * --- lynx
 * --- panthera
 * --- lions
 * --- tigers
 * --- puma
 * --- herpestidae
 * --- hyaenidae
 * --- mephitidae
 * --- mustelidae
 * --- ferrets
 * --- mink
 * --- otters
 * --- pinnipedia
 * --- fur seals
 * --- sea lions
 * --- seals, earless
 * --- phoca
 * --- walruses
 * --- procyonidae
 * --- raccoons
 * --- ursidae
 * --- viverridae
 * --- cetacea
 * --- dolphins
 * --- bottle-nosed dolphin
 * --- common dolphins
 * --- stenella
 * --- whale, killer
 * --- whales, pilot
 * --- porpoises
 * --- phocoena
 * --- whales
 * --- balaenoptera
 * --- fin whale
 * --- minke whale
 * --- beluga whale
 * --- bowhead whale
 * --- humpback whale
 * --- sperm whale
 * --- chiroptera
 * --- elephants
 * --- hyraxes
 * --- insectivora
 * --- hedgehogs
 * --- moles
 * --- shrews
 * --- lagomorpha
 * --- hares
 * --- rabbits
 * --- marsupialia
 * --- macropodidae
 * --- opossums
 * --- didelphis
 * --- monodelphis
 * --- phalangeridae
 * --- trichosurus
 * --- phascolarctidae
 * --- potoroidae
 * --- monotremata
 * --- echidna
 * --- platypus
 * --- perissodactyla
 * --- equidae
 * --- horses
 * --- primates
 * --- haplorhini
 * --- catarrhini
 * --- cercopithecidae
 * --- cercopithecinae
 * --- cercocebus
 * --- cercocebus atys
 * --- cercopithecus
 * --- cercopithecus aethiops
 * --- erythrocebus
 * --- erythrocebus patas
 * --- macaca
 * --- macaca fascicularis
 * --- macaca mulatta
 * --- macaca nemestrina
 * --- macaca radiata
 * --- mandrillus
 * --- papio
 * --- papio anubis
 * --- papio cynocephalus
 * --- papio hamadryas
 * --- papio papio
 * --- papio ursinus
 * --- theropithecus
 * --- colobinae
 * --- colobus
 * --- hominidae
 * --- gorilla gorilla
 * --- humans
 * --- pan paniscus
 * --- pan troglodytes
 * --- pongo pygmaeus
 * --- hylobatidae
 * --- hylobates
 * --- platyrrhini
 * --- atelidae
 * --- callitrichidae
 * --- callimico
 * --- callithrix
 * --- leontopithecus
 * --- saguinus
 * --- cebidae
 * --- alouattinae
 * --- alouatta
 * --- aotinae
 * --- aotus trivirgatus
 * --- cebinae
 * --- cebus
 * --- saimirinae
 * --- saimiri
 * --- tarsii
 * --- tarsiidae
 * --- strepsirhini
 * --- cheirogaleidae
 * --- lemuridae
 * --- lemur
 * --- lorisidae
 * --- galago
 * --- rodentia
 * --- chinchilla
 * --- dipodomys
 * --- gophers
 * --- guinea pigs
 * --- mole rats
 * --- spalax
 * --- muridae
 * --- arvicolinae
 * --- cricetinae
 * --- cricetulus
 * --- mesocricetus
 * --- phodopus
 * --- gerbillinae
 * --- murinae
 * --- mice
 * --- mice, congenic
 * --- mice, inbred strains
 * --- mice, inbred a
 * --- mice, inbred akr
 * --- mice, inbred balb c
 * --- mice, inbred c3h
 * --- mice, inbred c57bl
 * --- mice, inbred mdx
 * --- mice, inbred cba
 * --- mice, inbred cftr
 * --- mice, inbred dba
 * --- mice, inbred hrs
 * --- mice, inbred icr
 * --- mice, inbred mrl lpr
 * --- mice, inbred nod
 * --- mice, inbred nzb
 * --- mice, inbred sencar
 * --- mice, mutant strains
 * --- mice, biozzi
 * --- mice, inbred mdx
 * --- mice, jimpy
 * --- mice, knockout
 * --- mice, neurologic mutants
 * --- mice, nude
 * --- mice, obese
 * --- mice, quaking
 * --- mice, scid
 * --- mice, transgenic
 * --- mice, knockout
 * --- rats
 * --- rats, inbred strains
 * --- rats, inbred aci
 * --- rats, inbred bb
 * --- rats, inbred bn
 * --- rats, inbred buf
 * --- rats, inbred dahl
 * --- rats, inbred f344
 * --- rats, inbred lec
 * --- rats, inbred lew
 * --- rats, inbred oletf
 * --- rats, inbred shr
 * --- rats, inbred wf
 * --- rats, inbred wky
 * --- rats, long-evans
 * --- rats, mutant strains
 * --- rats, brattleboro
 * --- rats, gunn
 * --- rats, nude
 * --- rats, zucker
 * --- rats, sprague-dawley
 * --- rats, wistar
 * --- sigmodontinae
 * --- peromyscus
 * --- spalax
 * --- myoxidae
 * --- octodon
 * --- porcupines
 * --- sciuridae
 * --- marmota
 * --- scandentia
 * --- tupaiidae
 * --- tupaia
 * --- sirenia
 * --- dugong
 * --- trichechus
 * --- trichechus inunguis
 * --- trichechus manatus
 * --- xenarthra
 * --- armadillos
 * --- sloths
 * --- reptiles
 * --- alligators and crocodiles
 * --- dinosaurs
 * --- lizards
 * --- iguanas
 * --- snakes
 * --- boidae
 * --- colubridae
 * --- elapidae
 * --- bungarus
 * --- cobra
 * --- hydrophidae
 * --- viperidae
 * --- agkistrodon
 * --- bothrops
 * --- crotalus
 * --- russell's viper
 * --- trimeresurus
 * --- turtles

--- annelida

 * --- leeches
 * --- hirudo medicinalis
 * --- oligochaeta
 * --- polychaeta

--- arthropods

 * --- arachnida
 * --- acari
 * --- mites
 * --- acaridae
 * --- psoroptidae
 * --- pyroglyphidae
 * --- dermatophagoides farinae
 * --- dermatophagoides pteronyssinus
 * --- sarcoptidae
 * --- sarcoptes scabiei
 * --- tetranychidae
 * --- trombiculidae
 * --- ticks
 * --- argasidae
 * --- argas
 * --- ornithodoros
 * --- ixodidae
 * --- dermacentor
 * --- ixodes
 * --- rhipicephalus
 * --- rhipicephalus sanguineus
 * --- scorpions
 * --- spiders
 * --- black widow spider
 * --- crustacea
 * --- amphipoda
 * --- anostraca
 * --- artemia
 * --- arguloida
 * --- cladocera
 * --- daphnia
 * --- copepoda
 * --- decapoda (crustacea)
 * --- anomura
 * --- astacoidea
 * --- brachyura
 * --- crangonidae
 * --- nephropidae
 * --- palaemonidae
 * --- palinuridae
 * --- pandalidae
 * --- penaeidae
 * --- euphausiacea
 * --- isopoda
 * --- thoracica
 * --- horseshoe crabs
 * --- insects
 * --- beetles
 * --- fireflies
 * --- tenebrio
 * --- tribolium
 * --- weevils
 * --- cockroaches
 * --- blattellidae
 * --- periplaneta
 * --- diptera
 * --- ceratopogonidae
 * --- chironomidae
 * --- culicidae
 * --- aedes
 * --- anopheles
 * --- anopheles gambiae
 * --- culex
 * --- ochlerotatus
 * --- drosophilidae
 * --- drosophila
 * --- drosophila melanogaster
 * --- glossinidae
 * --- tsetse flies
 * --- muscidae
 * --- houseflies
 * --- psychodidae
 * --- phlebotomus
 * --- simuliidae
 * --- tephritidae
 * --- ceratitis capitata
 * --- fleas
 * --- hemiptera
 * --- aphids
 * --- heteroptera
 * --- cimicidae
 * --- bedbugs
 * --- reduviidae
 * --- triatominae
 * --- panstrongylus
 * --- rhodnius
 * --- triatoma
 * --- hymenoptera
 * --- ants
 * --- bees
 * --- wasps
 * --- isoptera
 * --- lepidoptera
 * --- butterflies
 * --- moths
 * --- bombyx
 * --- manduca
 * --- spodoptera
 * --- lice
 * --- anoplura
 * --- pediculus
 * --- phthirus
 * --- mallophaga
 * --- mantodea
 * --- orthoptera
 * --- grasshoppers
 * --- locusta migratoria
 * --- gryllidae

--- chordata, nonvertebrate

 * --- hyperotreti
 * --- hagfishes
 * --- urochordata
 * --- ciona intestinalis

--- cnidaria

 * --- anthozoa
 * --- renilla
 * --- sea anemones
 * --- cubozoa
 * --- hydrozoa
 * --- hydra
 * --- scyphozoa
 * --- sea nettle, east coast

--- echinodermata

 * --- sea cucumbers
 * --- cucumaria
 * --- holothuria
 * --- stichopus
 * --- sea urchins
 * --- anthocidaris
 * --- arbacia
 * --- hemicentrotus
 * --- lytechnius
 * --- paracentrotus
 * --- strongylocentrotus
 * --- strongylocentrotus purpuratus
 * --- starfish
 * --- asterias
 * --- asterina

--- helminths

 * --- acanthocephala
 * --- moniliformis
 * --- nematoda
 * --- adenophorea
 * --- enoplida
 * --- dioctophymatoidea
 * --- mermithoidea
 * --- trichuroidea
 * --- capillaria
 * --- trichinella
 * --- trichinella spiralis
 * --- trichuris
 * --- secernentea
 * --- ascaridida
 * --- ascaridoidea
 * --- anisakis
 * --- ascaridia
 * --- ascaris
 * --- ascaris lumbricoides
 * --- ascaris suum
 * --- toxascaris
 * --- toxocara
 * --- toxocara canis
 * --- oxyurida
 * --- oxyuroidea
 * --- enterobius
 * --- rhabditida
 * --- rhabdiasoidea
 * --- strongyloides
 * --- strongyloides ratti
 * --- strongyloides stercoralis
 * --- rhabditoidea
 * --- caenorhabditis
 * --- caenorhabditis elegans
 * --- spirurida
 * --- camallanina
 * --- dracunculoidea
 * --- dracunculus nematode
 * --- spirurina
 * --- filarioidea
 * --- brugia
 * --- brugia malayi
 * --- brugia pahangi
 * --- dipetalonema
 * --- dirofilaria
 * --- dirofilaria immitis
 * --- loa
 * --- mansonella
 * --- microfilaria
 * --- onchocerca
 * --- onchocerca volvulus
 * --- setaria nematode
 * --- wuchereria
 * --- wuchereria bancrofti
 * --- spiruroidea
 * --- thelazioidea
 * --- gnathostoma
 * --- strongylida
 * --- ancylostomatoidea
 * --- ancylostoma
 * --- necator
 * --- necator americanus
 * --- heligmosomatoidea
 * --- nematospiroides
 * --- nematospiroides dubius
 * --- nippostrongylus
 * --- metastrongyloidea
 * --- angiostrongylus
 * --- angiostrongylus cantonensis
 * --- strongyloidea
 * --- oesophagostomum
 * --- strongylus
 * --- trichostrongyloidea
 * --- dictyocaulus
 * --- haemonchus
 * --- ostertagia
 * --- trichostrongylus
 * --- tylenchida
 * --- tylenchoidea
 * --- platyhelminths
 * --- cestoda
 * --- diphyllobothrium
 * --- sparganum
 * --- echinococcus
 * --- echinococcus granulosus
 * --- echinococcus multilocularis
 * --- hymenolepis
 * --- hymenolepis diminuta
 * --- hymenolepis nana
 * --- mesocestoides
 * --- spirometra
 * --- sparganum
 * --- taenia
 * --- cysticercus
 * --- taenia saginata
 * --- taenia solium
 * --- trematoda
 * --- dicrocoeliidae
 * --- dicrocoelium
 * --- echinostomatidae
 * --- echinostoma
 * --- fasciolidae
 * --- fasciola
 * --- fasciola hepatica
 * --- heterophyidae
 * --- opisthorchidae
 * --- clonorchis sinensis
 * --- opisthorchis
 * --- paramphistomatidae
 * --- schistosomatidae
 * --- schistosoma
 * --- schistosoma haematobium
 * --- schistosoma japonicum
 * --- schistosoma mansoni
 * --- troglotrematidae
 * --- paragonimus
 * --- paragonimus westermani
 * --- turbellaria
 * --- planarians
 * --- rotifera

--- mollusca

 * --- bivalvia
 * --- arcidae
 * --- scapharca
 * --- cardiidae
 * --- corbicula
 * --- dreissena
 * --- mercenaria
 * --- mya
 * --- mytilidae
 * --- mytilus
 * --- mytilus edulis
 * --- perna
 * --- ostreidae
 * --- crassostrea
 * --- ostrea
 * --- pectinidae
 * --- pecten
 * --- pinctada
 * --- spisula
 * --- unionidae
 * --- anodonta
 * --- unio
 * --- cephalopoda
 * --- decapodiformes
 * --- loligo
 * --- sepia
 * --- nautilus
 * --- octopodiformes
 * --- gastropoda
 * --- aplysia
 * --- clione
 * --- conus snail
 * --- hermissenda
 * --- pleurobranchaea
 * --- snails
 * --- biomphalaria
 * --- bulinus
 * --- helix (snails)
 * --- lymnaea
 * --- tritonia sea slug
 * --- polyplacophora

--- plankton

 * --- zooplankton

--- porifera

 * --- agelas
 * --- axinella
 * --- callyspongia
 * --- crambe sponge
 * --- dysidea
 * --- geodia
 * --- haliclona
 * --- petrosia
 * --- plakortis
 * --- suberites
 * --- theonella
 * --- xestospongia

--- protozoa

 * --- apicomplexa
 * --- coccidia
 * --- eimeriida
 * --- cryptosporidiidae
 * --- cryptosporidium
 * --- cryptosporidium parvum
 * --- eimeriidae
 * --- cyclospora
 * --- eimeria
 * --- eimeria tenella
 * --- isospora
 * --- sarcocystidae
 * --- neospora
 * --- sarcocystis
 * --- toxoplasma
 * --- eucoccidiida
 * --- haemosporida
 * --- plasmodium
 * --- plasmodium berghei
 * --- plasmodium chabaudi
 * --- plasmodium cynomolgi
 * --- plasmodium falciparum
 * --- plasmodium gallinaceum
 * --- plasmodium knowlesi
 * --- plasmodium malariae
 * --- plasmodium ovale
 * --- plasmodium vivax
 * --- plasmodium yoelii
 * --- piroplasmia
 * --- piroplasmida
 * --- babesia
 * --- babesia bovis
 * --- babesia microti
 * --- theileria
 * --- theileria annulata
 * --- theileria parva
 * --- blood-borne pathogens
 * --- ciliophora
 * --- kinetofragminophorea
 * --- trichostomatida
 * --- trichostomatina
 * --- balantidium
 * --- oligohymenophorea
 * --- hymenostomatida
 * --- peniculina
 * --- paramecium
 * --- paramecium aurelia
 * --- paramecium caudatum
 * --- paramecium tetraurelia
 * --- tetrahymenina
 * --- tetrahymena
 * --- tetrahymena pyriformis
 * --- tetrahymena thermophila
 * --- polymenophorea
 * --- hypotrichida
 * --- sporadotrichina
 * --- euplotes
 * --- oxytricha
 * --- haplosporida
 * --- myxomycetes
 * --- physarida
 * --- physarum
 * --- physarum polycephalum
 * --- phytoplankton
 * --- sarcomastigophora
 * --- mastigophora
 * --- phytomastigophorea
 * --- dinoflagellida
 * --- pfiesteria piscicida
 * --- euglenida
 * --- euglena
 * --- euglena gracilis
 * --- volvocida
 * --- chlamydomonas
 * --- chlamydomonas reinhardtii
 * --- zoomastigophora
 * --- diplomonadida
 * --- giardia
 * --- giardia lamblia
 * --- kinetoplastida
 * --- trypanosomatina
 * --- crithidia
 * --- crithidia fasciculata
 * --- leishmania
 * --- leishmania braziliensis
 * --- leishmania donovani
 * --- leishmania enriettii
 * --- leishmania guyanensis
 * --- leishmania infantum
 * --- leishmania major
 * --- leishmania mexicana
 * --- leishmania tropica
 * --- trypanosoma
 * --- trypanosoma brucei brucei
 * --- trypanosoma brucei gambiense
 * --- trypanosoma brucei rhodesiense
 * --- trypanosoma congolense
 * --- trypanosoma cruzi
 * --- trypanosoma lewisi
 * --- trypanosoma vivax
 * --- trichomonadida
 * --- dientamoeba
 * --- trichomonas
 * --- trichomonas vaginalis
 * --- tritrichomonas
 * --- tritrichomonas foetus
 * --- sarcodina
 * --- eumycetozoea
 * --- dictyosteliida
 * --- dictyostelium
 * --- physarida
 * --- physarum
 * --- physarum polycephalum
 * --- lobosea
 * --- amoebida
 * --- acanthopodina
 * --- acanthamoeba
 * --- acanthamoeba castellanii
 * --- blastocystina
 * --- blastocystis
 * --- blastocystis hominis
 * --- tubulina
 * --- amoeba
 * --- endolimax
 * --- entamoeba
 * --- entamoeba histolytica
 * --- hartmannella
 * --- schizopyrenida
 * --- naegleria
 * --- naegleria fowleri
 * --- spores
 * --- spores, protozoan
 * --- oocysts
 * --- sporozoites