source:[1] Pfizer Files Antitrust Suit to Block Novo Nordisk Acquisition of Metsera (https://finance.yahoo.com/m/2ab550e5-4350-3d4 ...)[2] Pfizer, As Promised, Sues To Stop Novo's Rival Metsera Bid - BioSpace (https://vertexaisearch.cloud.google.com/groun ...)