Figure 1
From: Identification of uterine ion transporters for mineralisation precursors of the avian eggshell
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.