| Abbreviation | Definition |
|---|---|
| PSI | Prostaglandin Synthetase Inhibitor |
| PSL | Photo-Stimulated Luminescence |
| PT | Peptidyl Transfer |
| PTK | Protein-Tyrosine Kinase |
| PTLS | PotockiLupski syndrome |
| PTLS | Potocki–Lupski syndrome |
| PTP | Protein Tyrosine Phosphatase |
| PTP1 | Protein Tyrosine Phosphatase 1 |
| PTP2 | Protein Tyrosine Phosphatase 2 |
| PTPB | Protein Tyrosine Phosphatase - Beta |
| PTPD | Protein Tyrosine Phosphatase binding Domain |
| PTPJ | Protein-Tyrosine Phosphatase - J |
| PTPK | Protein-Tyrosine Phosphatase - Kappa |
| PTPO | Porcine Thyroid PerOxidase |
| PTPRG | Protein Tyrosine Phosphatase, Receptor Type Gamma |
| PTPRM | Protein Tyrosine Phosphatase, Receptor Type M |
| PTPRY | Protein Tyrosine Phosphatase, Receptor Type Y |
| PTPRZ | Protein Tyrosine Phosphatase, Receptor Type Z |
| PTPRZ1 | Protein Tyrosine Phosphatase, Receptor Type Z, Polypeptide 1 |
| PTPS | Pyruvoyl-TetrahydroPterin Synthase |