Atara Biotherapeutics Inc. licensed a pair of mesothelin-directed CAR T treatments, ATA-2271 and ATA-3271, to Bayer AG for $60 million up front with the potential for $610 million in development, regulatory and commercialization milestone payments. Atara is also eligible for tiered royalties that peak in the low double-digit percentage of net sales of the two drugs. South San Francisco-based Atara will provide translational and clinical manufacturing services for the two drugs that will be reimbursed by Bayer.