Earlier forms of this GM crop included the transgenic tomato (FlavrSavr) which had a “deactivated” gene. This meant that the tomato plant was no longer able to produce polygalacturonase, an enzyme involved in fruit softening. The premise was that tomatoes could be left to ripen on the vine and still have a long shelf life, thus allowing them to develop their full flavour. Normally, tomatoes are picked well before they are ripe and are then ripened artificially.