WAP four-disulfide core domain protein 2 - also known as Human Epididymis Protein 4[5] (HE4) - is a protein that in humans is encoded by the WFDC2gene.[6][7][8]
This gene encodes a protein that is a member of the WFDC domain family. The WFDC domain, or WAP Signature motif, contains eight cysteines forming four disulfide bonds at the core of the protein, and functions as a protease inhibitor in many family members. This gene is expressed in pulmonary epithelial cells, and was also found to be expressed in some ovarian cancers.[5] The encoded protein is a small secretory protein, which may be involved in sperm maturation.[8]
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