FIGURE 1 | Two echinoderm models for regeneration studies.
From the following article:
Bridging the regeneration gap: insights from echinoderm models
Nature Reviews Genetics 8, (April 2007)
doi:10.1038/nrg1923-c1
a | A sea star, Asterias rubens, with three regenerating arms. b | A brittlestar, Amphiura filiformis, with six scars that indicate sites of regeneration.
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