| S1P | Sphingosisne-1-phosphate |
| S1PR | Sphingosisne-1-phosphate receptor |
| Cer | Ceramide |
| SM | Sphingomyelin |
| UCA | Umbilical cord artery |
| fPAEC | Fetal placental arterial endothelial cells |
| SPT | Serine palmitoyltranferase |
| SPTLC1 | Serine palmitoyltranferase long chain base subunit 1 |
| SPTLC2 | Serine palmitoyltranferase long chain base subunit 2 |
| SPNS2 | Spinster transporter 2 |
| SPHK1 | Sphingosine kinase 1 |
| SPHK2 | Sphingosine kinase 2 |
| SGPP1 | Sphingosisne-1-phosphate phosphatase 1 |
| SGPL1 | Sphingosisne-1-phosphate lyase 1 |
| Nogo-B | Reticulon-4B |