has endpoint has measure group has assay method involves biological process mitotic G1 phase mitotic S phase mitotic G2 phase mitotic M phase measure group phospholipid redistribution estimation chromatin condensation visualization caspase activity determination membrane permeability assessment mitochondrial membrane potential assessment percent apoptotic cells percent mitotic cells percent interphase cells percent DNA replicated cells percent G2 arrested cells mitotic cell cycle state assay 'involves biological process' some 'mitotic cell cycle arrest' 'involves biological process' some 'mitotic cell cycle arrest' and 'apoptotic process' S phase assessment method M phase assessment method cell cycle state assay percent mitotic arrested cells