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ADAM20 is the functional equivalent of sperm fertilin-alpha (ADAM1), since that gene is nonfunctional in human. And northern blot analysis detected the 2.8-kb ADAM20 mRNA only in testis. The exclusive expression of ADAM20 in human testis and their sequence similarity with the fertilins suggest that it is expressed on sperm cells and involved in sperm maturation and/or fertilization(PMID:9469942). The full length protein has a singnal peptide, propeptide and 6 glycosylation sites.