Biology textbooks may be due for a rewrite.
For the first time, scientists have detected a DNA structure inside living human cells that looks more like a four-stranded knot than the elegant double helix we learned about in school.
The tangled shape, known as an i-motif, had been seen before in the lab, but few researchers expected it to occur in human cells.
The new work shows not only that i-motifs do indeed exist in human cells, but that they may be quite common. http://www.latimes.com/science/sciencenow/la-sci-sn-dna-i-motif-20180423-story.html