paper F Anton-Erxleben, A Thomas, J Wittlieb, S Fraune, and TCG Bosch (2008). Plasticity of epithelial cell shape in response to upstream signals: a whole-organism study using transgenic Hydra. Zoology, 112(3): 185-194

paper K Khalturin, F Anton-Erxleben, S Sassmann, J Wittlieb, G Hemmrich, and TCG Bosch (2008). A novel gene family controls species-specific morphological traits in Hydra. PLoS Biology 6 (11): e278 see also the  “Tentacles test tenets of evolution” commentary in “The Scientist” Featured as “Research highlights” in Nature Reviews Genetics January 2009 Volume 10 Number 1

paper Siebert S, Anton-Erxleben F and Bosch TCG (2008)
Cell type complexity in the basal metazoan Hydra is maintained by both stem cell based mechanisms and transdifferentiation.
Dev. Biol. 313: 13-24