Introducing Graphic Guide to the most exciting field in biology today, Epigenetics.

Cath Ennis has a research background in genetics, genomics and cancer, and works as a grant writer and project manager in Vancouver, Canada. She writes about epigenetics and other topics for The Guardian, has co-written a textbook on stem cell science, and can be found online at enniscath.com.

Oliver Pugh is a designer and illustrator.