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然而，代之以随机的填满每一个斑点，包含了一定排序的基因促使其成为四螺旋结构。
Yet, instead of randomly filling each spot, the genes included sequences prompting them fold into four-helix structures (right).
左边是银河系的目前结构，显示其两条主螺旋臂，右边是较早的银河系图像，有四条主螺旋臂。
New infrared images of the Milky Way show just two major spiral arms, Scutum-Centaus and Perseus, along with a newly discovered arm called Far 3kpc Arm.
富含鸟嘌呤碱基的DNA序列能够通过鸟嘌呤环的互联作用形成四链螺旋结构，这种结构被称为G-四链体。
In addition to the familiar duplex DNA, certain G-rich DNA sequences can fold into a variety of four-stranded structures, which are called G-quadruplexes.
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