Fig. 5From: Playing with genetic and epigenetic concepts at the school: an Epigenetic Orchestra projectExample of external characters that vary according to changes in epigenetic marks. In this picture we see adjacent prickly and non-prickly leaves that grew along the same branch of holly trees (Ilex aquifolium) and differed in the frequency of 5-methyl-Cytosines at certain positions of their genetic sequence (Herrera and Bazaga 2013). Image courtesy of Carlos M. HerreraBack to article page