The nucleoplasmic concentrations of the nucleolar proteins increase by NC. The normalized nucleoplasmic intensities (arbitrary units) per unit volume, excluding the nucleoli, for EGFP-Mod, EGFP-Ns1, EGFP-Nopp140, and Pit-EGFP are shown as . Times 0 marks the beginning of interphase (I) and end of mitosis (M).