I have performed 3-5 IF experiments using PP2 in varying concentrations from 3-10 uM and it seems at the higher end of the concentrations I used (5uM and 10uM) half of the cells on my cover slips have a decrease in cell area. I am using SUM159 breast cancer cells and am having a difficult time sifting through the literature available to get an answer. I have seen some results demonstrating that PP2 can inhibit cell spreading but if anybody has any experience in this area your input would be greatly appreciated.