Early evidence--it remains to be proven in trials--is that they might slip past a clot that was causing a heart attack or stroke and deliver crucial air to oxygen-starved tissue.

• 早期的证据(还有待进一步试验的检验)表明它可能从导致心脏病或中风的血栓旁溜过，将至关重要的氧气送到缺氧组织。