Human DNA includes eight nucleotides instead of the four originally identified.
The human recipe just got complicated: It turns out there are more ingredients in us than we thought.
In high school science, we were taught of the four basic units that make up DNA -- adenine, guanine, thymine and cytosine. When scientists talk of DNA sequencing, it's written as strings of these units: ATCGGTGA, and so on.
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In recent years, scientists expanded that list of nucleotides from four to six. And in a study published online in the most recent issue of Science magazine, researchers from the University of North Carolina School's medical school have discovered the seventh and eight bases of DNA.
Read More: http://news.discovery.com/human/new-dna-sequence-110727.html
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