Novo Nordisk A/S has taken the plunge and bought its RNA interference (RNAi) technology development partner Dicerna Pharmaceuticals Inc. for around $3.3 billion. Bagsværd, Denmark-based Novo Nordisk has been working with Dicerna, of Lexington, Mass., since 2019 on therapies that selectively silence genes that cause or contribute to disease. RNAi is triggered by double stranded RNA, which causes degradation of a specific RNA target that codes for a rogue disease-causing protein.