Does it also inhibit cell wall synthesis of non-bacteria cells? If yes, it's toxic to us. If no, bacteria cell walls could evolve to be more like non-bacteria cell walls in order to avoid this. Two links from the Wikipedia article on Teixobactin about this: http://www.the-scientist.com/?articles.view/articleNo/41850/... http://www.bbc.com/news/health-30657486 (Actually, Teixobactin only works on gram-positive bacteria, not on gram-negative ones which have an extra membrane.)