科学家们成功地创造了第一个具有‘alien’ DNA. In normal DNA, which can be found within the genes of every organism , the twin strands of the double helix are bonded together with four bases, known as T, G, A, 和 C. In this new organism, the researchers added two new bases, X 和 Y, creating a new form of DNA that has never occurred in billions of years of evolution on Earth or elsewhere in the universe. Remarkably, the semi-synthetic 外星人 organism continued to reproduce normally, preserving the new 外星人 DNA during reproduction. In the future, this breakthrough should allow for the creation of highly customized organisms —细菌,动物,人类—以奇怪而奇妙的方式表现出来,这是世俗的四碱基DNA永远不允许的。