A symposium on trichosanthin organized by Acad emia Sinica washeld at Beijing in April 22-25,1986 Trichosanthin is a single-chain,basic protein extracted from Trichosanthes,a Chinese herbalmedicine has been widely used in some contryside in terminatingpregancy.Scientists and medical doctors from the Shanghai Insti-tute of Organic Chemistry and the Institute of Cell Biology andsome hospitals have found that the purified and crystallized tri-