The siRNA is deployed first. It acts for hours, giving enough time to silence and block those survival genes. siRNA首先开始行动。它需要几个小时，来让（癌细胞的）生存基因失效。 We have now disabled those genetic superpowers. 我们去除了（
Hi, everybody. This week, we made it official—I'm going to Cuba. 大家好。这个星期，我们正式决定，我即将出访古巴。 When Michelle and I go to Havana next month, it will be the first visit of a U.S. president to Cuba in nea
