Nail Biting: More Than Just a Bad Habit?

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Video still courtesy "Nature" and Francis Lee

Mice bred with a Slitrk5 mutation groom themselves compulsively.

In the updated "Bible of psychiatry," the Diagnostic and Statistical Manual of Mental Disorders, there's a new category called the Obsessive Compulsive Spectrum. It includes not just OCD, but other behaviors that are far more common. Reporter: Amy Standen

• More: Is Nail Biting a Pathology? Or Just a Bad Habit? (QUEST)