Billions of years ago, four kinds of molecules that spun and jumped on our planet, like the sudden will, gracefully formed the DNA double helix in a way we still can’t imagine, for the life on our planet. A genetic code is provided. These four molecules are adenine, guanine, cytosine, and thymine. We usually use the four letters A, G, C, and T to represent these four natural bases. Under normal circumstances, when the two DNA strands wound together to form a double helix, each strand will base on the key pair to each other: A for T, C for G .
Nowadays, a recent study published in the journal Science shows that the composition of this life has changed from four to eight ! Scientists have succeeded in creating synthetic bases that can also store and transcribe genetic information. In theory, these extended synthetic bases can also be used to support life.