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Table 1 Differences in the resting membrane potential (Rm) and the permeability ratio

From: Hamster oocyte membrane potential and ion permeability vary with preantral cumulus cell attachment and developmental stage

  CUMULUS ENCLOSED   DENUDED  
  Preantral Metaphase II Preantral Metaphase II
OOCYTE Rm n = 10 -38.4 ± 4.5 mV+,++ -19.7 ± 0.8 mV -19.7 ± 0.5 mV -19.8 ± 0.5 mV
CUMULUS Rm n = 3 -28.6 ± 1.2 mV*    
OOCYTE PNa/PK n = 10 0.33 ± 0.03** 0.76 ± 0.04 0.79 ± 0.014 0.77 ± 0.02