Transdifferentiation occurs continuously in adult hydra.
D000818:Animals; D002454:Cell Differentiation; D004475:Ectoderm / Q000166:cytology; D004847:Epithelial Cells; D006829:Hydra / Q000166:cytology* / Q000254:growth & development; D009420:Nervous System / Q000166:cytology; D009474:Neurons / Q000166:cytology