Regulatory T-cell specialist Quell Therapeutics Ltd. has sealed a potential $2 billion agreement under which Astrazeneca plc is taking rights to two autologous Treg cell therapies for treating inflammatory bowel disease (IBD) and type 1 diabetes. Quell will receive $85 million up front, the majority of which is in cash, with a modest (undisclosed) equity investment. Reaching the $2 billion headline figure will involve a series of development and commercial milestones and royalties on sales.