Cabaletta Bio, Inc., a clinical-stage biotechnology company, focuses on the discovery and development of engineered T cell therapies for patients with autoimmune diseases. Its lead product candidate is resecabtagene autoleucel, a 4-1BB co-stimulatory domain-containing fully human CD19-CAR T, which is in Phase 1/2 clinical trials for the treatment of dermatomyositis, anti-synthetase syndrome, immune-mediated necrotizing myopathy, juvenile myositis, lupus nephritis, non-renal systemic lupus erythematosus, relapsing and progressive multiple sclerosis, mucocutaneous and mucosal pemphigus vulgaris (PV), systemic sclerosis, and generalized myasthenia gravis. The company also develops DSG3-CAART, a CAAR T cell therapy that is in Phase 1 clinical trial for the treatment of mucosal PV; and MuSK-CAART, an investigational cell therapy in Phase 1 trial for treating patients with anti-muscle-specific kinase (MuSK) antibody positive myasthenia gravis. It has collaborations with the University of Pennsylvania and the Children’s Hospital of Philadelphia; Nanjing IASO Biotherapeutics Co., Ltd; Oxford Biomedica; Autolus Holdings (UK) Limited; and WuXi Advanced Therapies, Inc.