$anatomical entity ; BILA:0000000
 %immaterial anatomical entity ; BILA:0000007
  %anatomical line ; BILA:0000008
  %anatomical point ; BILA:0000009
  %anatomical space ; BILA:0000005
   %cell space ; BILA:0000062
  %anatomical surface ; BILA:0000010
 %material anatomical entity ; BILA:0000006
  %anatomical structure ; BILA:0000003
   %acellular anatomical structure ; BILA:0000040
    %basal lamina ; BILA:0000065
   %anatomical group ; BILA:0000054
    %anatomical cluster ; BILA:0000041
    %anatomical system ; BILA:0000011
     %cardiovascular system ; BILA:0000016
      @OBO_REL:part_of:heart ; BILA:0000020
     %digestive system ; BILA:0000082 ; synonym:alimentary system
      @OBO_REL:part_of:digestive tract ; BILA:0000083 ; synonym:<new synonym> ; synonym:alimentary canal ; synonym:gastrointestinal tract ~ primitive gut ; BILA:0000084
       @OBO_REL:part_of:foregut ; BILA:0000085 ~ ectoderm ; BILA:0000036
       @OBO_REL:part_of:hindgut ; BILA:0000087 ~ ectoderm ; BILA:0000036
       @OBO_REL:part_of:midgut ; BILA:0000086 ~ endoderm ; BILA:0000038
     %immune system ; BILA:0000104
     %musculature system ; BILA:0000088
      %cardiac musculature ; BILA:0000134
      %somatic musculature ; BILA:0000133
      %visceral muculature ; BILA:0000132
     %nervous system ; BILA:0000079 ~ neuroectoderm ; BILA:0000039
      @OBO_REL:part_of:central nervous system ; BILA:0000080 ; synonym:CNS
       @OBO_REL:part_of:brain ; BILA:0000135
       @OBO_REL:part_of:nerve cord ; BILA:0000136
      @OBO_REL:part_of:peripheral nervous system ; BILA:0000081 ; synonym:PNS
       @OBO_REL:part_of:sensory system ; BILA:0000099
        %chemosensory system ; BILA:0000139
         %gustatory system ; BILA:0000143
         %olfactory system ; BILA:0000144
        %mechanosensory system ; BILA:0000142
        %photosensory system ; BILA:0000140
         %eye ; BILA:0000017
     %urogenital system ; BILA:0000122
      @OBO_REL:part_of:excretory system ; BILA:0000015 ; synonym:renal system
       @OBO_REL:part_of:metanephridium ; BILA:0000127
       @OBO_REL:part_of:protonephridium ; BILA:0000126
      @OBO_REL:part_of:reproductive system ; BILA:0000103
       @OBO_REL:part_of:gonad ; BILA:0000123
        %ovary ; BILA:0000125
        %testis ; BILA:0000124
   %cell ; BILA:0000013
    %epithelial cell ; BILA:0000077
    %single cell organism ; BILA:0000064
   %cell component ; BILA:0000014 @OBO_REL:part_of: cell ; BILA:0000013
   %compound organ ; BILA:0000024
    %cavitated compound organ ; BILA:0000072
    @OBO_REL:part_of:compound organ component ; BILA:0000019 % multi-tissue structure ; BILA:0000055
    %solid compound organ ; BILA:0000074
   %embryonic structure ; BILA:0000034
    %blastomere ; BILA:0000052
    %germ layer ; BILA:0000035
     %ectoderm ; BILA:0000036
      @OBO_REL:part_of:neuroectoderm ; BILA:0000039
     %endoderm ; BILA:0000038
     %mesoderm ; BILA:0000037
      @OBO_REL:part_of:cardiac mesoderm ; BILA:0000051
      @OBO_REL:part_of:somatic mesoderm ; BILA:0000047
      @OBO_REL:part_of:visceral mesoderm ; BILA:0000044
    %organizer ; BILA:0000053 ; synonym:Spemann's organizer
    %primitive gut ; BILA:0000084
   %extraembryonic structure ; BILA:0000042
   %multi-cellular organism ; BILA:0000012
    %adult organism ; BILA:0000078 ~ juvenile organism ; BILA:0000076
    %asexual organism ; BILA:0000030
    %embryonic organism ; BILA:0000056 ; synonym:developing organism
     %blastula embryo ; BILA:0000059 ~ cleaving embryo ; BILA:0000058
     %cleaving embryo ; BILA:0000058 ~ zygote embryo ; BILA:0000057
     %gastrula embryo ; BILA:0000060 ~ blastula embryo ; BILA:0000059
     %neurula embryo ; BILA:0000061 ~ gastrula embryo ; BILA:0000060
     %segmenting embryo ; BILA:0000075 ~ neurula embryo ; BILA:0000061
     %zygote embryo ; BILA:0000057
    %gonochoristic organism ; BILA:0000048 ; synonym:monoecious organism
     %female organism ; BILA:0000028
     %male organism ; BILA:0000027
    %hermaphroditic organism ; BILA:0000029 ; synonym:dioecious organism
     %sequential hermaphroditic organism ; BILA:0000045 ; synonym:consecutive hermaphroditic organism
      %protandrous hermaphroditic organism ; BILA:0000049
      %protogynous hermaphroditic organism ; BILA:0000050
     %synchronous hermaphroditic organism ; BILA:0000046 ; synonym:serially hermaphroditic organism
    %juvenile organism ; BILA:0000076 ~ segmenting embryo ; BILA:0000075
   %multi-tissue structure ; BILA:0000055
    %simple organ ; BILA:0000021
   %organism subdivision ; BILA:0000032
    %appendage ; BILA:0000018
    %head ; BILA:0000115
    %surface ; BILA:0000118 ; synonym:skin
    %tail ; BILA:0000117
    %trunk ; BILA:0000116
   %portion of tissue ; BILA:0000043
    %epithelium ; BILA:0000066
     %atypical epithelium ; BILA:0000071
     %multilaminar epithelium ; BILA:0000069
     %unilaminar epithelium ; BILA:0000073
      %simple columnar epithlium ; BILA:0000068
      %simple cuboidal epithelium ; BILA:0000067
      %simple squamous epithelium ; BILA:0000070
  %portion of organism substance ; BILA:0000004
   %portion of cell substance ; BILA:0000063
$bilateria developmental stage ; BILS:0000105
 %adult stage ; BILS:0000113 @OBO_REL:preceded_by: juvenile stage ; BILS:0000112
 %blastula stage ; BILS:0000108 @OBO_REL:preceded_by: cleavage stage ; BILS:0000107
 %cleavage stage ; BILS:0000107 @OBO_REL:preceded_by: zygote stage ; BILS:0000106
 %gastrula stage ; BILS:0000109 @OBO_REL:preceded_by: blastula stage ; BILS:0000108
 %juvenile stage ; BILS:0000112 @OBO_REL:preceded_by: organogenesis stage ; BILS:0000111
 %neurula stage ; BILS:0000110 @OBO_REL:preceded_by: gastrula stage ; BILS:0000109
 %organogenesis stage ; BILS:0000111 ; synonym:segmentation stage @OBO_REL:preceded_by: neurula stage ; BILS:0000110
 %zygote stage ; BILS:0000106 ; synonym:one cell stage
$nephros ; BILA:0000128