The random generation of T-cell receptors creates a diverse repertoire capable of recognizing novel pathogens.

“Largely random. It actually there's the pieces of DNA at this part of the the DNA actually recombine and get pasted together in in unique ways. >> So it's probabilistic. >> It's probabilistic and that's what allows us to have cells that lying there in waiting for things that we've never encountered. If a a a bacteria might come into existence or a virus might come into existence that doesn't even exist now in nature, but we might have tea cells lying there waiting that could be engaged by those proteins on the surface that viruses would introduce.”