The Transferrin reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Transferrin

Transferrin is a protein for iron ion delivery. When transferrin loaded with iron encounters a transferrin receptor on the surface of a cell, it bind to it and is consequently transported into the cell in a vesicle. The cell will acidify the vesicle, causing transferrin to release its iron ions.

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