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Table 1 PH and ion concentrations in blood plasma, uterine fluid and epithelial cells during eggshell mineralisation[5]

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

  Blood plasma Epithelial cells Uterine fluid
    8 h PO 18 h PO
Ions [mM] [mM] [mM] [mM]
Ca2+ 1.2 <0.0002 6 10
Na+ 140 12 144 80
K+ 4 139 12 60
HCO3- 23 12 60 110
pH 7.4 7.0-7.4 7.6 7.1
Cl- 130 4 71 45
  1. The eggshell precursors are secreted in the uterine fluid where the eggshell mineralization daily takes place from 10 hours to 22 hours post ovulation (yolk entry in the oviduct). PO: post ovulation.