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Characteristic nerve nets in ctenophores and cnidarians. (a) The polygonal epithelial nerve net of Pleurobrachia pileus redrawn after Jager et al. [45]. (b) The epithelial nerve net of the Hydra polyp from Arendt [53]. (c) Cellular view of the Hydra nerve net. Nerve nets are known to contain stereotypic elements with distinct transmitters [54]. Redrawn after Lentz [50].
