Planarians are free-living (non-parasitic) freshwater organisms possessing derivatives of all three germ layers (i.e., ectoderm, mesoderm and endoderm). These animals are renowned for their developmental plasticity and have attracted the attention of generations of biologists (http://planaria.neuro.utah.edu). Among all flatworm species studied thus far, the planarian Schmidtea mediterranea is rapidly emerging as a key model organism for the study of regeneration, tissue homeostasis and stem cell biology. The Schmidtea mediterranea Genome Database (SmedGD) is a GMOD compliant database that integrates in a single web-accessible portal all available data associated with the planarian genome, including predicted and annotated genes, ESTs, protein homologies, gene expression patterns and RNAi phenotypes. ... [Information of the supplier]