A number of agrochemical companies, including Bayer and Syngenta, have been looking at ways to make complex protein drugs in plants, although progress has been slow.

• 一些农用化学品公司，包括拜耳和先正达，一直在寻找方法使复杂的蛋白质类药物在植物中表达，虽然进展是缓慢的。