Cabaletta Bio, Inc. is a clinical-stage biotechnology company focused on discovering and developing engineered T cell therapies for autoimmune diseases. Its lead candidate, resecabtagene autoleucel, is a fully human CD19-CAR T therapy with a 4-1BB co-stimulatory domain and is in Phase 1/2 trials for multiple autoimmune conditions. The company also develops DSG3-CAART and MuSK-CAART, both in Phase 1 trials. It has collaborations with the University of Pennsylvania, the Children's Hospital of Philadelphia, Nanjing IASO Biotherapeutics, Oxford Biomedica, Autolus Holdings (UK) Limited, and WuXi Advanced Therapies. Formerly Tycho Therapeutics, Inc., it changed its name to Cabaletta Bio, Inc. in August 2018, was incorporated in 2017, and is headquartered in Philadelphia, Pennsylvania.