> What's striking is the binary nature of immunotherapy. When the genes are expressed, they work; when not, they don't. Antibodies and the hypervariable region

> What's striking is the binary nature of immunotherapy. When the genes are expressed, they work; when not, they don't. Antibodies and the hypervariable regions of the T cell apparatus are the van der Waals equivalent of a socket wrench: it either fits or it doesn't. That's what makes them so attractive for drug development. We can design the code, insert it into a bacterium or phage and then make as many socket wrenches as we want using little more than the principles and equipment used for brewimg beer.