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URL: http://scholar.google.com/scholar_lookup?title=The+carcinoembryonic+antigen+%28CEA%29+family%3A+structures%2C+suggested+functions+and+expression+in+normal+and+malignant+tissues.&year=1999&author=Hammarstr%C3%B6m&journal=Semin+Cancer+Biol.&volume=9&issue=2&pages=67-81&doi=10.1006%2Fscbi.1998.0119&pmid=10202129