
FDA reviews a proposed Keytruda biosimilar, Roche expands its obesity pipeline with an RNAi deal, and guselkumab shows promise for fistula remission in Crohn disease.
• Using stirred-tank bioreactors for stem cell culture provides advantages. • Factors to consider include OTR, agitation speed, and impeller blades. • An eight-blade impeller can address challenges associated with scale-up.






