One states that calcium competes for an iron binding site on intestinal epithelial cells. It is believed calcium binds to the protein mobilferrin on the epithelial cells, which is the iron transport protein(Whiting, p.78). Another group of scientists theorizes that iron is able to be transported into the epithelial cells without problem, however the iron then has trouble getting into the blood stream...
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Another group of scientists theorizes that iron is able to be transported into the epithelial cells without problem, however the iron then has trouble getting into the blood stream. The presence of calcium inhibits iron's ability to leave the epithelial layer. Another very interesting theory is not on the microscopic level but in the evolutionary plane...
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