观察经乙酸双氧铀染色后的铁钴样品，发现在蛋白质分子内有一个明显的黑色颗粒，这就是我们合成的铁钴纳米颗粒，说明纳米颗粒是在蛋白质空腔内形成。
We found that there is a distinct black particle in the protein cavity through observing the TEM picture of the Fe-Co sample which was stained by the uranium acetate ; this is the Fe-Co nano particle we synthesized .
乙酸双氧铀