Expanding DNA’s alphabet lets cells produce novel proteins

WASHINGTON (AP) — Scientists are expanding the genetic code of life, using man-made DNA to create a semi-synthetic strain of bacteria — and new research shows those altered microbes actually worked to produce proteins unlike those found in nature.
It’s a step toward designer drug development.
One of the first lessons in high school biology: All life is made up of four DNA building blocks known by the letters A, T, C and G. Paired together, they form DNA’s ladder-like rung