[Analysis of the tissue interactions responsible for the mesonephogenic determination in amphibians, by the in vitro culture technic].

The cultivation of mesonephric lateral mesoblast, in combination with the dorso-caudal endoblast, with or without cordomesoderm, leads to the differentiation of mesonephric tubules in Bufo bufo and Pleurodeles waltlii. Then, the nephric duct does not seem to be necessary to nephric differentiation under in vitro cultivation conditions.