Distant relatives

What does it mean to work for the greater good of humanity? What are the costs? Which ethical dilemmas must scientists navigate daily, and where and how do we draw the line? Animal testing is one such dilemma that confronts many scientists in the biomedical field. I imagine a daily encounter between a lab worker and a Crab-eating macaque or cynomolgus monkey on this canvas. Crab-eating macaques, to their detriment, are similar to humans and are often used to test the toxicity of new drugs. How do we reconcile using sentient creatures as invaluable tools for drug discovery?