Soriano i Fradera, JordiColombo, CyrilOtt, Albrecht2019-06-182019-06-182006-12-180031-9007https://hdl.handle.net/2445/135287We study biological, multicellular symmetry breaking on a hollow cell sphere as it occurs during hydra regeneration from a random cell aggregate. We show that even a weak temperature gradient directs the axis of the regenerating animal but only if it is applied during the symmetry-breaking moment. We observe that the spatial distribution of the early expressed, head-specific gene k s 1 has become scale-free and fractal at that point. We suggest the self-organized critical state to reflect long range signaling, which is required for axis definition and arises from cell next-neighbor communication.4 p.application/pdfeng(c) American Physical Society, 2006Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article6011482019-06-18info:eu-repo/semantics/openAccess