PTPN22
（重定向自LYP）
Protein tyrosine phosphatase, non-receptor type 22 (lymphoid), also known as PTPN22, is a protein that in humans is encoded by the PTPN22 gene. This gene can be expressed in different forms. PTPN22 affects the responsiveness of T and B cell receptors, and mutations are associated with increases or decreases in risks of autoimmune diseases.