Table 1.

Main characteristics of the groups where genetic transfection has been achieved^*.

Group	Biologic interactions	Adult body	Life cycle	Example of genus
Tricladida	Mostly free-living	Nonsegmented	Simple	Dugesia, Schmidtea
Trematoda	Endoparasites of invertebrates and vertebrates	Nonsegmented	Complex	Fasciola, Schistosoma
Cestoda	Endoparasites of vertebrates	Segmented	Complex	Taenia, Echinococcus