“… T 292/85 Polypeptide expression/GENENTECH [1989] O.J. E.P.O. 275; T409/91 Fuel Oils/EXXON [1994] O.J. E.P.O. 653; Kirin-Amgen Inc v Hoechst Marion Roussel Ltd [2005] R.P.C. 9, [112]. But the specification in Biogen described only one method of making the molecule by recombinant technology and disclosed no general principle. It was e…”