Tokyo, Japan and Cambridge, UK, 24 November 2023 – Sosei Group Corporation (“Sosei Heptares” or “the Company”; TSE: 4565) announces it has initiated discussions with GSK to regain full ownership of GSK4381406, a highly selective first-in-class, oral GPR35 agonist in development under a Global Collaboration and License Agreement with GSK as a potential new treatment for Inflammatory Bowel Diseases (IBD). GPR35 is an important orphan G protein-coupled receptor (“GPCR”) with an established genetic association to IBD, for which there remains significant unmet need for millions of sufferers worldwide.

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Sosei Heptares to Regain Full Ownership of GSK4381406*, a Clinic-ready, First-in-Class Oral GPR35 Agonist for Inflammatory Bowel Disease