| PLXNB3 | Plexin-B3. Receptor for SEMA5A that plays a role in axon guidance, invasive growth and cell migration. |
| POTEC | POTE ankyrin domain family member C. Highest expression level is in testis. |
| PPIAL4G | Peptidyl-prolyl cis-trans isomerase A-like 4G. PPIases accelerate the folding of proteins. |
| PRAMEF18 | PRAME family member 18. Negative apoptosis regulation. Negative regulation of cell differentiation. |
| PRAMEF22 | PRAME family member 22. Negative apoptosis regulation. Negative regulation of cell differentiation. |
| PRF1 | Perforin-1. Plays a key role in secretory granule-dependent cell death, and in defense against virus-infected or neoplastic cells. Plays an important role in killing other cells that are recognized as non-self by the immune system, e.g. in transplant rejection or some forms of autoimmune disease. |
| PSMA8 | Proteasome subunit alpha-type 8. Component of the spermatoproteasome, a form of the proteasome specifically found in testis that promotes degradation of histones, thereby participating actively to the exchange of histones during spermatogenesis. |
| RBMX | RNA-binding motif protein, X chromosome. RNA-binding protein that plays several role in the regulation of pre- and post-transcriptional processes. |
| RBMXL1 | RNA binding motif protein, X-linked-like-1. RNA-binding protein which may be involved in pre-mRNA splicing. |
| RGS11 | Regulator of G-protein signaling 11. Inhibits signal transduction by increasing the GTPase activity of G protein alpha subunits thereby driving them into their inactive GDP-bound form. |
| RIT2 | GTP-binding protein Rit2. Binds and exchanges GTP and GDP. Binds and modulates the activation of POU4F1 as gene expression regulator. |
| RLN3 | Relaxin-3. May play a role in neuropeptide signaling processes. Ligand for LGR7, relaxin-3 receptor-1 (GPCR135) and relaxin-3 receptor-2 (GPCR142). |
| SAMD10 | Sterile alpha motif domain-containing protein 10. |
| SCN9A | Sodium channel protein type 9 subunit alpha. Plays a role in pain mechanisms, especially in the development of inflammatory pain. |
| SETX | Probable helicase senataxin. Probable RNA/DNA helicase involved in diverse aspects of RNA metabolism and genomic integrity. Plays a role in neurite outgrowth in hippocampal cells through FGF8-activated signaling pathways. Inhibits retinoic acid-induced apoptosis (PubMed: 21576111). |
| SFXN1 | Sideroflexin-1. Might be involved in the transport of a component required for iron utilization into or out of the mitochondria. |
| SLC22A13 | Solute carrier family 22 member 13. Nicotinate transmembrane transporter activity. |
| SLC23A2 | Solute carrier family 23 member 2. L-ascorbate:sodium symporter activity. |
| SLC25A5 SLC25A5 | ADP/ATP translocase 2. Catalyzes the exchange of cytoplasmic ADP with mitochondrial ATP across the mitochondrial inner membrane. |