| Label | Id | |
|---|---|---|
| pronephros | http://purl.obolibrary.org/obo/MAT_0000117 | |
| prosencephalon | http://purl.obolibrary.org/obo/MAT_0000105 | |
| prostate | http://purl.obolibrary.org/obo/MAT_0000078 | |
| proximal | http://purl.obolibrary.org/obo/MAT_0000491 | |
| proximal part of limb | http://purl.obolibrary.org/obo/MAT_0000093 | |
| radicle | http://purl.obolibrary.org/obo/MAT_0000415 | |
| radicle | http://purl.obolibrary.org/obo/MAT_0000413 | |
| rectal sac | http://purl.obolibrary.org/obo/MAT_0000050 | |
| rectum | http://purl.obolibrary.org/obo/MAT_0000050 | |
| renal system | http://purl.obolibrary.org/obo/MAT_0000027 | |
| renal/urinary system | http://purl.obolibrary.org/obo/MAT_0000027 | |
| respiratory system | http://purl.obolibrary.org/obo/MAT_0000030 | |
| retina | http://purl.obolibrary.org/obo/MAT_0000142 | |
| rhombencephalon | http://purl.obolibrary.org/obo/MAT_0000107 | |
| rhombomere | http://purl.obolibrary.org/obo/MAT_0000272 |