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Description
The intrinsic factor (IF) is a glycoprotein secreted by the parietal cells of the gastric mucosa that binds to vitamin B12 once it has been released from the R proteins, making it resistant to gastric and pancreatic proteases and forming a B12+intrinsic factor complex known as the Castle complex

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doi: 10.1016/S0076-6879(10)73005-6

doi: 10.1038/s41598-019-47461-5 148 HaydenMSGhoshS
