8). Determining the receptоr (the prоtein оn the surfаce of humаn cells thаt binds to the Spike protein) of the SARS-CoV2 virus in human cells was an active area of research after the emergence of COVID-19. Angiotension Converting Enzyme-2 (ACE-2) was determined to be the human receptor protein. ACE-2 is found on human epithelial cells lining the nasal passages, lungs, heart, blood vessels, and gastrointestinal tract. How would these experimental data be best described?