normal level of substance in cell normal reactive oxygen species level during stationary phase normal reactive oxygen species level in stationary phase normal ROS level during stationary phase normal ROS level in stationary phase normal ROS accumulation during stationary phase A cell phenotype in which the amount of reactive oxygen species (ROS) measured in a cell that is normal (i.e. indistinguishable from wild type) during stationary phase. normal reactive oxygen species accumulation during stationary phase