Abstract

The Britten–Davidson model of genetic regulation was well received by American molecular biologists and embryologists, but not by the members of the French School of molecular biology. In particular, François Jacob considered it too abstract and too removed from experiments. I re-examine the contrast between the Britten–Davidson model and the operon model by Jacob and Monod, the different scientific contexts in which they were produced and the different roles they played. I also describe my recent encounters with Eric Davidson, and how I discovered the extraordinary continuity of his work on the development of the sea urchin, as well as his rich personality.