The biotech giant moves to strengthen its immunology portfolio with the acquisition of San Diego-based small molecule specialist. Millie Nelson,Senior Editor, Partnering and Investment,BioXconomy The deal is valued at up to $1 billion and marks a strategic investment in Biogen's pipeline diversification efforts. Biogen will provide an undisclosed upfront payment to RayThera's shareholders. Most of the $1 billion total value is tied to future clinical and regulatory milestone achievements.