由于美国航天飞机已停止使用,美国的制药公司和 Payload Systems 公司的其它委托人,将能够使他们的实验在几乎失重的条件下,在苏联和平号空间站上完成。Payload Sys-tem 公司不愿透露他们委托人的名称,但他们说其中包括要在失重条件下生长蛋白质晶体的美国制药公司。对 X 射线照射晶体的研究是决定一个蛋白质三级结构(蛋白质工程的基础) Since the U.S. space shuttle has ceased to be used, U.S. pharmaceutical companies and other principals of Payload Systems will be able to make their experiments on the Soviet Mir space station under almost weightless conditions. Payload Systems declined to disclose the names of their principals, but they said they include American pharmaceutical companies that want to grow protein crystals under weightless conditions. The study of X-ray-irradiated crystals determines a protein tertiary structure (the basis of protein engineering)