I had a similar experience when I was working in his lab, trying to isolate the first inhibitors of blood-vessel growth (which were large-molecular-weight substances). This required developing a bioassay that would enable us to observe the inhibition of blood-vessel growth in the presence of tumors.
我在他的实验室工作时也有过类似的经历，我当时负责分离抑制血管生长的主要大分子量物质。这需要发明一种生物测定法，让我们在肿瘤生长过程中观察对血管生长的抑制。