Various receptor molecules of interest arranged in the form of a 2D physical array and tested for qualitative and quantitative inhibition/binding are called assays. Each of the mini-circular grids you see in the next photo is for an assay called 96 well plate, which can be used to test inhibition:
They are test systems that are created as one of the first steps in drug development and toxicity testing. The effects of chemical compounds on cellular, molecular, or biochemical processes ...