Introduction and overview : biotechnology, risk regulation, and the failure of cooperation -- The domestic sources of the conflict: why the US and EU biotech regulatory regimes differ -- The promise and failure of transatlantic regulatory cooperation through networks -- Deliberation or bargaining? : distributive conflict and the fragmented international regime complex -- WTO dispute settlement meets GMOS : who decides? -- US and EU policies since 2000 : change, continuity and (lack of) convergence -- Conclusions : the lessons of transatlantic conflict, developing countries and the future of agricultural biotechnology.