Genetics

Researchers Add New Letters to Life’s Genetic Alphabet

Why does the factory of life rely exclusively on four machines, the DNA bases A, G, C and T? To get an answer, scientists at Scripps Research Institute tried working with a host of other potential base molecules. Recently, they succeeded in inserting an extra set of bases into the DNA of an E. coli bacterium, and managed to get it to reproduce with the extra DNA bases in tact.