Another team of scientists led by Dr. Josef Penninger of the University of British Columbia invented a medicine called APN01. They tested APN01 in engineered human tissue. This is human cells put together to act like part of the body, but it is not a whole animal or person. They added a protein called "human recombinant soluble angiotensin converting enzyme 2" (hrsACE2) and saw that it stopped the virus from taking over cells. They named their hrsACE2 APN01.