DNA: Expanding code of life with new 'letters'
Wednesday, May 27, 2015 - 11:00
in Biology & Nature
The DNA encoding all life on Earth is made of four building blocks called nucleotides, commonly known as 'letters,' that line up in pairs and twist into a double helix. Now, two groups of scientists are reporting for the first time that two new nucleotides can do the same thing -- raising the possibility that entirely new proteins could be created for medical uses.