I'm performing clonogenic assay however something is so confused that I'm determining the IC50 of the drug in 96 well plate for 5000 cell/well. Plate 150.000 cell/well for RNA isolation or obtaining pellets with the same IC50 concentrations. However if I plated 1000 cells/well for clonogenic assay and apply IC50 concentrations, most of the cells can die. Do you think that should I use IC30, IC50 and IC70 ceoncentrations together, or just IC50 is enough?