abnormal mitotic G1/S phase transition abolished mitotic G1/S phase transition following nitrogen starvation-induced G1 phase arrest mitotic G1/S phase transition abolished after recovery from nitrogen starvation-induced G1 arrest abolished mitotic G1 phase progression following nitrogen starvation-induced G1 phase arrest midori mitotic cell cycle G1/S phase transition abolished following nitrogen starvation-induced G1 phase arrest A G1/S delay may indicate that a checkpoint, such as the cell size checkpoint or the G1/S DNA damage checkpoint, is activated. Checkpoint activation can be tested using checkpoint kinase mutants. abolished cell cycle progression through mitotic G1/S phase transition following cell cycle arrest in mitotic G1 phase in response to nitrogen starvation abolished mitotic G1/S transition following nitrogen starvation-induced G1 phase arrest FYPO:0003548 2014-07-15T14:10:19Z A cell cycle phenotype in which the G1/S transition of the mitotic cell cycle does not occur after the cell has been arrested in G1 phase due to nitrogen starvation. The cell remains arrested in G1.