translation.en: So we think that we can expand or contract genomes, depending on your point of view here, to maybe 300 to 400 genes The only way to prove these ideas was to construct an artificial chromosome with those genes in them, and we had to do this in a cassette-based fashion.
translation.zh: 基因库扩大更多 因此我们认为可以从最少500个基因 扩展或缩小 ——取决你怎么看这个问题—— 到约300到400个基因 证明这些理论的唯一方法 是以这些基因人工构建一个染色体 而且我们必须用基于表达框的方式来达到这一目的