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Classic hypothesis concerning ion transfers in the hen uterus during eggshell calcification [1,5,8-10]. Ca2+ entry in cell is passive via a Ca2+ channel, 28 kDa calbindin contributes to intracellular transfer and maintenance of a low Ca2+level. Ca2+ secretion involving a Ca2+ ATPase and a Ca2+/Na+ exchanger. Carbonic anhydrase has a key role in providing carbonate from plasma CO2.
