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WASHINGTON – Ever wonder why sharks get several rows of teeth and people only get one? Some geneticists did, and their discovery could spur work to help adults one day grow new teeth when their own wear out.
A single gene appears to be in charge, preventing additional tooth formation in species destined for a limited set.
Finding genes that make teeth grow all in a row (http://news.yahoo.com/s/ap/20090226/ap_on_he_me/med_making_teeth_grow - broken link)