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. Author manuscript; available in PMC: 2011 Sep 2.
Published in final edited form as: J Genet Genomics. 2009 Feb;36(2):63–73. doi: 10.1016/S1673-8527(08)60093-4

Fig. 2.

Fig. 2

Waddington's developmental landscape. The ball represents a cell, and the bifurcating system of valleys represents the bundles of trajectories in the functional space. Similar to Wright's shifting balance theory, such landscape indicates the possibility of transitions between different functional states (from C.H. Washington, 1957).