What they had actually done was describe the way in which two long chemical chains wound up around each other to encodetheinformation cells need to build and maintain our bodies.
The "G" refers to guanine, one of the four chemical groups, or "bases", that hold DNA together and which encode our genetic information(the others being adenine, cytosine, and thymine).
The rotation of the image is significant because, according to Dr. Franke-Arnold it can be used to encodeinformation, giving the technique a possible application in computing.