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. Author manuscript; available in PMC: 2014 Dec 2.
Published in final edited form as: Bioessays. 2014 Sep 10;36(12):1185–1194. doi: 10.1002/bies.201400065

Figure 1.

Figure 1

Environmental stress has substantial impact on cnidarian life cycles. In Turritopsis nutricula, stress can reverse the development and make a medusa transforming into a polyp. A: Free-living healthy medusa. B: Stress-triggered transforming medusa. C: Balllike stage of transforming medusa. BrdU staining of replicating nuclei. D: Butterfly-shape remnant of adult medusa producing a hydrorhizal stolon characteristic of the polyp stage (black arrow). E: A newly formed polyp from reverse development of a medusa. Scale bars: A: 1 mm; B: 500 μm; C: 300 μm; D and E: 500 μm. Taken from Piraino et al. [14].