Cambridge University scientists say they have seen four-stranded DNA at work in human cells for the first time.
The famous “molecule of life”, which carries our genetic code, is more familiar to us as a double helix. But researchers tell the journal Nature Chemistry that the “quadruple helix” is also present in our cells, and in ways that might possibly relate to cancer. 
No matter what they finally find out, one thing is for sure: life (and life’s ingredients) are not as easy to categorize as our limited human mind thinks…
We have much to learn, which is quite exciting!