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What happens is that in the standard way of developing a vaccine, you don't jump to invest in the next step until you're pretty sure that the step you're in is working, given the fact that we needed to do this as quickly as possible without sacrificing safety or scientific integrity, the federal government partnered with multiple of these companies and said,' Guess what, we're going to move fast and we're going to assume we're going to be successful. And if we are, we've saved several months. And if we're not, the only thing we've lost is money. But better lose money than lose lives by delaying the vaccine.' So, right now, the initial data from the study showed that. It makes me cautiously optimistic that we can induce a response that would be protective.