Fuente: WIPO "tomato" The present invention pertains to the field of pest control. In particular, the invention pertains to bioassays to measure the response of insect cells to toxinsm. Furthermore, the invention pertains to methods for identifying receptors which play a role in the interaction of insecticidal toxins and insect cells. The invention thus also pertains to the identification of toxins having an activity against an insect cell, and to toxins that interact with receptor molecules.