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Expanding life's alphabet

发布时间:2019-03-07 07:19:14来源:未知点击:

By Mark Schrope in San Francisco, California IN AN attempt to go one better than nature, researchers in California are expanding the genetic code that has given rise to just about every form of life. They hope to create artificial DNA capable of producing proteins no one has ever seen before. Apart from RNA viruses, all organisms carry their genetic information in strings of DNA built from the same 4 bases, adenine, which pairs with thymine, and cytosine, which pairs with guanine. These bases are grouped in units of three called codons,