Although the monoclonal antibodies infused into Trump were not made from or in fetal cells, Regeneron did develop that treatment with the help of a long-lived line of cells established from the kidneys of a fetus electively aborted in the Netherlands around 1972. The company relied on those widely used cells, known HEK-293 cells, to make mimics of the coronavirus spike protein. The antiviral drug Remdesivir, which Trump took last week, was also developed with those same cell lines. The New York Times reports at least 2 other pharmas working on a coronavirus vaccine also rely on the cells, and Johnson & Johnson is testing its vaccine using another cell line derived from fetal tissue.