There are four important points to make for interpretation. First, the measurements apply to the reaction conditions and the system used. Although we tried to mimic in planta conditions (and produced evi- dence for this), it is an important caveat that applies to most flux control measurements. Second, control is shared between the Blocks. Indeed, it should be appreciated that control is shared by all enzymes involved in a pathway. Although some enzymes will exert more flux control than others, there is no such thing as the rate-controlling enzyme (despite what textbooks often tell us!). Third, different inhibitors were useful for double-manipulation in the different crops i.e. extrapolation from one species to another can be risky. Finally, the flux control exerted by the two Blocks was similar in olive and oil palm but different in oilseed rape.