![Figure 1 Schematic of the clock model as proposed by Thorogood (1991). (A) The bold arrow represents the timing of the AER-to-AF transition in the developmental process. (B-D) Hypothesized representations of fin/limb development in the clock model (above) with endochondral skeletal patterns of the fin/limb (below,). (B) Fin development in a teleost, demonstrating a short period of time with AER signaling prior to the AER-to-AF transition. (C) Fin development in lobe-finned fishes, showing a longer relative time with AER signaling prior to AF transformation. (D) Limb development in a tetrapod, in which AER signaling persists throughout limb development. Figure modified from Yano et al. [3]; based on Thorogood [2]; with fossil form representations in C-D from Long et al. [4].](http://thenode.biologists.com/wp-content/uploads/2013/04/node1-70x45.png){kind=small}
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Like us on FacebookWhich image will get the coveted cover spot is up to you to decide. Choose your favourite before May 21st, noon GMT. There are 8 images to choose from. Click any of them to see a bigger version.
1. Six zebrafish
2. Drosophila ovaries, HisGFP
3. Planarian in situ
4. Planarian confocal
5. Sea urchin
6. Drosophila embryo, Knirps
7. Chick embryo
8. Xenopus embryo, sox3
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Eric
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Would the planarian confocal image, for example, look any better or worse depending on what is actually stained?
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