another team of scientists led by dr. josef penninger of the university of british columbia invented a medicine called apn01 and tested it in engineered human tissue, meaning human cells put together in a lab to look and act like they were inside a body. the scientists learned that adding human soluble recombinant angiotensin converting enzyme 2 (ace2) to these tissues infected with sars-cov-2 made it harder for the virus to reproduce.