2 more buyouts: Bristol Myers Squibb said on Tuesday it will acquire radiopharmaceutical firm RayzeBio for about $4.1 billion. And: AstraZeneca said on Tuesday it will buy Gracell Biotechnologies for up to $1.2 billion as the Anglo-Swedish pharma company furthers its cell therapy ambitions and boosts its presence in China, the world's second-largest pharmaceuticals market.