Instead, we've reasoned, then, that it must be the soluble factors, so we could collect simply the soluble fraction of blood which is called plasma, and inject either young plasma or old plasma into these mice, and we could reproduce these rejuvenating effects, but what we could also do now is we could do memory tests with mice.
于是，我们推论出， 一定是可溶的因子在作用， 所以我们只需采集血液中的可溶部分， 就是血浆， 将年轻或年老的血浆注射入这些小鼠， 我们就可以重现这些年轻化效果， 而且我们现在还可以做的是， 我们可以对小鼠进行记忆测试。