| anlage | http://purl.obolibrary.org/obo/MAT_0000478 | | |
| antenna | http://purl.obolibrary.org/obo/MAT_0000086 | | |
| anterior intestine | http://purl.obolibrary.org/obo/MAT_0000047 | | |
| anus | http://purl.obolibrary.org/obo/MAT_0000042 | | |
| aorta | http://purl.obolibrary.org/obo/MAT_0000035 | | |
| aortic arch | http://purl.obolibrary.org/obo/MAT_0000059 | | |
| apical | http://purl.obolibrary.org/obo/MAT_0000484 | | |
| apoplasm | http://purl.obolibrary.org/obo/MAT_0000348 | | |
| apoplast | http://purl.obolibrary.org/obo/MAT_0000348 | | |
| appendage | http://purl.obolibrary.org/obo/MAT_0000023 | | |
| appendix | http://purl.obolibrary.org/obo/MAT_0000287 | | |
| archaeobacterium | http://purl.obolibrary.org/obo/MAT_0000193 | | |
| arterial system | http://purl.obolibrary.org/obo/MAT_0000034 | | |
| artery | http://purl.obolibrary.org/obo/MAT_0000034 | | |
| ascending colon | http://purl.obolibrary.org/obo/MAT_0000311 | | |
| 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 | | |