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. Author manuscript; available in PMC: 2008 Aug 1.
Published in final edited form as: Curr Opin Genet Dev. 2007 Jul 23;17(4):264–271. doi: 10.1016/j.gde.2007.05.010

Figure 4.

Figure 4

Four models of morphogen dispersion. Movement of morphogen (red) from source cell (middle, purple) to outlying cells by diffusion, serial transfer (transcytosis), lipoprotein particle transfer, and directly (via cytonemes).