PTPN7 (Protein Tyrosine Phosphatase, Non-Receptor Type 7): PTPN7 is an enzyme involved in cell signalling, particularly within the immune system. It plays a key role in regulating T-cell activation and differentiation, thereby influencing immune responses. Dysregulation of PTPN7 can contribute to immune-related disorders and may have implications in autoimmune diseases and cancer due to its effects on cell signalling pathways.