These chains of dozens or more amino acids, called protein domains, are “like a wheel” on a car, Wehbi said in a statement: “It’s a part that can be used in many different cars ...

The genetic code acts as life’s instruction manual, telling cells how to build proteins from DNA and RNA. Though it's a ...

"It's a part that can be used in many different cars, and wheels have been around much longer than cars." To get a handle on when a specific amino acid likely was recruited into the genetic code ...