  Epigenetics is most often reduced to chromatin marking in the current
literature, whereas this notion was initially defined in a more general
context. This restricted view ignores that epigenetic memories are in fact more
robustly ensured in living systems by steady state mechanisms with permanent
molecule renewal. This misconception is likely to result from misleading
intuitions and insufficient dialogues between traditional and quantitative
biologists. To demystify dynamic epigenetics, its most famous image, a
Waddington landscape and its attractors, are explicitly drawn. The simple
example provided is sufficient to highlight the main requirements and
characteristics of dynamic gene networks, underlying cellular differentiation,
de-differentiation and trans-differentiation.
