Conversation so far:
What is an interesting fact about Tu youyou's background?
Tu youyou studied at the Department of Pharmaceutical Sciences, and graduated in 1955.
What did Tu Youyou discover in her studies?
Tu youyou discovered artemisinin and dihydroartemisinin, used to treat malaria, a breakthrough in twentieth-century tropical medicine
Did Tu youyou work with any others?
Tu youyou was appointed head of the Project 523 research group at her institute. Tu was initially sent to Hainan where she studied patients who had been infected with malaria
Was malaria a problem in China?
malaria was a major cause of death in China's southern provinces, including Hainan, Yunnan, Guangxi, and Guangdong
WHat did Tu youyou observe?
tu youyou's team had screened over 2,000 traditional Chinese recipes and made 380 herbal extracts, from some 200 herbs, which were tested on mice. One compound was effective, sweet wormwood.
did Tu youyou use the sweet wormwood to treat Malaria?
sweet wormwood was used for intermittent fevers, a hallmark of malaria
Did tu youyou report her findings on sweet wormwood to anyone?
Tu youyou presented at the project seminar
What is the name of tu youyou's work presented at the seminar?
Tu youyou's work is a recipe titled, Emergency Prescriptions Kept Up One's Sleeve“
What other herb did tu youyou find medicinal besides sweet wormwood?
tu youyou's team had screened over 2,000 traditional Chinese recipes and made 380 herbal extracts, from some 200 herbs
WHat are some of the 200 herbs tu youyou's team used?

Question: What did she test on?
Self-contained rewrite: What did tu youyou test on?