Milleporesigma, Merck KGaA’s North American life sciences business, agreed to acquire Mirus Bio LLC from Gamma Biosciences LP for $600 million. Mirus develops tailored transfection solutions that deliver nucleic acid into cells used in production of viral vector-based gene therapies. It also provides contract development and manufacturing services. The transaction is expected to close in the third quarter of 2024, subject to U.S. regulatory approvals and customary closing conditions.