Here's a gene that's central to how nerve cells communicate with each other, so it's curious to us to see a grossly different protein variant. (scientificamerican.com)
The combination of 20 different building blocks — amino acids — results in an enormous variety of theoretically possible protein variants; many more than the estimated number of stars in the universe. (sciencedaily.com)
These mutations are inserted into batches of yeast or bacterial cells, which express the altered gene and produce millions of random protein variants. (sciencedaily.com)