| stigma | http://purl.obolibrary.org/obo/MAT_0000524 | stigma | |
| somatic stem cell | http://purl.obolibrary.org/obo/MAT_0000185 | stem cell | |
| stem cell | http://purl.obolibrary.org/obo/MAT_0000185 | stem cell | |
| multi fate stem cell | http://purl.obolibrary.org/obo/MAT_0000185 | stem cell | |
| blastocyst inner cell mass | http://purl.obolibrary.org/obo/MAT_0000185 | stem cell | |
| stem | http://purl.obolibrary.org/obo/MAT_0000239 | stem | |
| standing slug | http://purl.obolibrary.org/obo/MAT_0000328 | standing slug | |
| stamen | http://purl.obolibrary.org/obo/MAT_0000515 | stamen | |
| stalk | http://purl.obolibrary.org/obo/MAT_0000321 | stalk | |
| sporophyte stage | http://purl.obolibrary.org/obo/MAT_0000404 | sporophyte stage | |
| sporophore | http://purl.obolibrary.org/obo/MAT_0000331 | sporophore | |
| spore - sexual | http://purl.obolibrary.org/obo/MAT_0000306 | spore - sexual | |
| spore - asexual | http://purl.obolibrary.org/obo/MAT_0000307 | spore - asexual | |
| spleen | http://purl.obolibrary.org/obo/MAT_0000085 | spleen | |
| spiracular gland | http://purl.obolibrary.org/obo/MAT_0000208 | spiracle | |
| spiracle | http://purl.obolibrary.org/obo/MAT_0000208 | spiracle | |
| spinal cord | http://purl.obolibrary.org/obo/MAT_0000183 | spinal cord | |
| spermathecum | http://purl.obolibrary.org/obo/MAT_0000168 | spermathecum | |
| seminal receptacle | http://purl.obolibrary.org/obo/MAT_0000168 | spermathecum | |
| spermatheca | http://purl.obolibrary.org/obo/MAT_0000168 | spermathecum | |
| semen | http://purl.obolibrary.org/obo/MAT_0000131 | spermatazoon | |
| spermatazoon | http://purl.obolibrary.org/obo/MAT_0000131 | spermatazoon | |
| sperm | http://purl.obolibrary.org/obo/MAT_0000131 | spermatazoon | |
| mature sperm cell | http://purl.obolibrary.org/obo/MAT_0000131 | spermatazoon | |
| male gamete | http://purl.obolibrary.org/obo/MAT_0000131 | spermatazoon | |
| sperm | http://purl.obolibrary.org/obo/MAT_0000218 | sperm | |
| sperm cell | http://purl.obolibrary.org/obo/MAT_0000218 | sperm | |
| somites | http://purl.obolibrary.org/obo/MAT_0000068 | somite | |
| somite | http://purl.obolibrary.org/obo/MAT_0000068 | somite | |
| somatic nervous system | http://purl.obolibrary.org/obo/MAT_0000342 | somatic nervous system | |