has marker percent activity percent G2 arrested cells This represents the percentage of cells in a cell population that have undergone the DNA synthesis in the S phase as indicated by staining positive for EdU, but have not undergone the M phase as they stained negative for MDM2. In other words, these cells were arrested in the G2/M cell cycle check-points after treatment with the respective perturbagen in the assay. EdU Anti-MPM-2