| blastocyst | http://purl.obolibrary.org/obo/MAT_0000067 | epiblast | |
| blastocyst | http://purl.obolibrary.org/obo/MAT_0000396 | blastula stage | |
| blastocyst inner cell mass | http://purl.obolibrary.org/obo/MAT_0000185 | stem cell | |
| blastoderm | http://purl.obolibrary.org/obo/MAT_0000419 | blastoderm | |
| blastoderm stage | http://purl.obolibrary.org/obo/MAT_0000396 | blastula stage | |
| blastula | http://purl.obolibrary.org/obo/MAT_0000392 | blastula | |
| blastula embryo | http://purl.obolibrary.org/obo/MAT_0000396 | blastula stage | |
| blastula stage | http://purl.obolibrary.org/obo/MAT_0000396 | blastula stage | |
| blood | http://purl.obolibrary.org/obo/MAT_0000083 | blood cells | |
| blood | http://purl.obolibrary.org/obo/MAT_0000315 | blood | |
| blood cells | http://purl.obolibrary.org/obo/MAT_0000083 | blood cells | |
| blood plasma | http://purl.obolibrary.org/obo/MAT_0000052 | blood plasma | |
| blood vessel | http://purl.obolibrary.org/obo/MAT_0000393 | blood vessel | |
| body ganglion | http://purl.obolibrary.org/obo/MAT_0000344 | body ganglion | |
| body part | http://purl.obolibrary.org/obo/MAT_0000293 | body part | |
| bone | http://purl.obolibrary.org/obo/MAT_0000299 | bone | |
| bone marrow | http://purl.obolibrary.org/obo/MAT_0000084 | bone marrow | |
| brain | http://purl.obolibrary.org/obo/MAT_0000098 | brain | |
| brainstem | http://purl.obolibrary.org/obo/MAT_0000111 | medulla oblonmgata | |
| branchial arch | http://purl.obolibrary.org/obo/MAT_0000059 | branchial arch | |
| bronchus | http://purl.obolibrary.org/obo/MAT_0000133 | bronchus | |
| brown fat | http://purl.obolibrary.org/obo/MAT_0000198 | brown fat | |
| buccal cavity | http://purl.obolibrary.org/obo/MAT_0000038 | mouth | |
| bud | http://purl.obolibrary.org/obo/MAT_0000229 | bud | |
| budding yeast | http://purl.obolibrary.org/obo/MAT_0000417 | budding yeast | |
| bulb | http://purl.obolibrary.org/obo/MAT_0000367 | bulb | |
| caecum | http://purl.obolibrary.org/obo/MAT_0000288 | caecum | |
| cambium | http://purl.obolibrary.org/obo/MAT_0000223 | cambium | |
| cardiac muscle | http://purl.obolibrary.org/obo/MAT_0000453 | myocardium | |
| cardiac ventricle | http://purl.obolibrary.org/obo/MAT_0000497 | ventricle | |