Milestone payments are becoming an increasingly familiar aspect of many biotech deals, notes Reuters, as buyers try to mitigate the risks inherent with big purchases. Take Celgene's $2.9 billion buyout of Abraxis; the biotech giant set aside $650 million in milestone payments if Abraxis' key drug Abraxane hit certain goals. "These structures are a great way for buyer and seller to share the risk that's related to drug development," analyst Brett Skolnik tells Reuters. Milestones also...