Press "Enter" to skip to content

Posts published by “SF Chronicles, USA Today, Discovery News”

Outside the gates

Growing Back Up Teeth

Restricting a gene may help adults grow new teeth when their own wear out.

This gene, named Osr2, prevents humans from growing more than one set of permanent teeth. When geneticists bred mice that lacked the gene, the rodents developed extra teeth next to their first molars as backups.