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. Author manuscript; available in PMC: 2018 Sep 1.
Published in final edited form as: Dev Dyn. 2017 Jul 12;246(9):691–699. doi: 10.1002/dvdy.24531

Figure 10.

Figure 10

Cx43 threshold model for joint initiation. Cx43 activity levels decrease to a threshold level, allowing for evx1 expression and, therefore, joint initiation. In the sof b123 mutant, where cx43 mRNA levels are reduced with respect to WT, the threshold is reached sooner, inducing premature joint initiation and resulting in short segments.