| Label | Id | |
|---|---|---|
| atrioventricular node | http://purl.obolibrary.org/obo/MAT_0000498 | |
| atrium | http://purl.obolibrary.org/obo/MAT_0000496 | |
| auditory apparatus | http://purl.obolibrary.org/obo/MAT_0000138 | |
| auditory system | http://purl.obolibrary.org/obo/MAT_0000138 | |
| autopod | http://purl.obolibrary.org/obo/MAT_0000091 | |
| axial skeleton | http://purl.obolibrary.org/obo/MAT_0000148 | |
| balancer organ | http://purl.obolibrary.org/obo/MAT_0000203 | |
| basal ganglion | http://purl.obolibrary.org/obo/MAT_0000450 | |
| basasl nucleus | http://purl.obolibrary.org/obo/MAT_0000200 | |
| bladder | http://purl.obolibrary.org/obo/MAT_0000122 | |
| blastocyst | http://purl.obolibrary.org/obo/MAT_0000067 | |
| blastocyst | http://purl.obolibrary.org/obo/MAT_0000396 | |
| blastocyst inner cell mass | http://purl.obolibrary.org/obo/MAT_0000185 | |
| blastoderm | http://purl.obolibrary.org/obo/MAT_0000419 | |
| blastoderm stage | http://purl.obolibrary.org/obo/MAT_0000396 |