SARS-CoV-2 viral spike protein binds to the membrane-bound form of angiotensin-converting enzyme 2 (ACE2) to infect the host cell. For this reason, we carried out a docking study to determine if ivermectin might be able to attach to the SARS-CoV-2 spike receptor-binding domain bound with ACE2. [...] The ivermectin docking site we identified, between the viral spike and the ACE2 receptor, may interfere with the attachment of the spike to the human cell membrane. 

You'd think at least 184 million years of evolution on entirely separate continents would be enough to make two species of fish sexually incompatible. That was the assumption scientists in Hungary were going on when they placed sperm from an American paddlefish near eggs from a Russian sturgeon in the lab.