PROBLEM TO BE SOLVED : To provide modified T lymphocytes for treating diseases, such as cancer.SOLUTION : Provided is a T lymphocyte comprising an artificial cell death polypeptide comprising an apoptosis-inducing domain, the artificial cell death polypeptide being a transmembrane protein comprising an extracellular domain comprising a CD20 epitope, a transmembrane domain, and an intracellular domain comprising the apoptosis induction domain, the apoptosis induction domain being caspase 3, caspase 8 or caspase 9, the polypeptide being capable dimerization using an anti-CD20 antibody which binds to the CD20 epitope, and an apoptosis induction signal being generated in the T lymphocytes when the antibody dimerizes the polypeptide.SELECTED DRAWING : NoneCOPYRIGHT : (C)2019, JPO&INPIT