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. Author manuscript; available in PMC: 2011 Feb 1.
Published in final edited form as: Ann N Y Acad Sci. 2010 Feb;1188:133–142. doi: 10.1111/j.1749-6632.2009.05093.x

Figure 2.

Figure 2

Proposed “push” and “pull” regulatory mechanisms. The solid lines represent connections that are well established. The dotted lines represent proposed “push” mechanisms, and the dashed lines represent the “pull” mechanisms. Appropriate citations are indicated adjacent to the connecting arrows.