The link I gave shows the products that Senomyx sells to.
deks - T1R (2 and 3) are a taste receptors. They enhancer Gα15 (a G protein which activate other cells)
Here is another patent by Senomyx US7344859B2 that shows how HEK293 cell is used to stimulate the receptors.
They test the effectiveness by the quantity of dopamine that is released.
https://patents.google.com/patent/US7344859B2/en