Perhaps you say the story buried deep in todays paper describing the observed mandibular tooth growth in a strain of mutant chickens. For decades scientists have been able to coax chicken embryos into forming teeth by overlaying epidemal tissue from repiltes or mice onto the forming jaws of a chicken embryo. The grafted tissue was not the source of the teeth but was by some unknown mechanism triggering the chickens dormant recessive tooth genes to awake. However for the first time rows of teeth have been observed growing without the aid of an outside foreign tissue trigger. Preliminary suggestions are that this particular chicken mutation strain's unusual jaw alignment is the key. The change in relative position of a tooth growth signalling center to responsive odontogenic tissue in the embryo appears to be the cause. IOW because some ancestral toothed bird populations were slack-jawed as embryos their teeth did not develope.
Heres a brief summary:tp://www.current-biology.com/content/article/abstract? (cut and paste to browser)
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