A raft of potentially high-value drug development collaborations, most for gene and RNA therapies, led the first day of the 40th Annual J.P. Morgan Healthcare Conference Monday. Pfizer Inc. enlisted Beam Therapeutic Inc. to advance in vivo base editing programs for up to $1.35 billion, while Bayer AG tapped Mammoth Biosciences Inc.’s in vivo CRISPR systems expertise in a potential $1 billion-plus deal. Selecta Biosciences Inc. inked a new $1.1 billion partnership with Ginkgo Bioworks Inc. to develop next-generation gene therapy capsids, while Acadia Pharmaceuticals Inc. agreed to pay Stoke Therapeutics Inc. as much as $967 million to develop RNA-based medicines. Work on new mRNA vaccines and therapies is also proceeding, with both Pfizer and Biontech SE announcing new collaborations in the space.