Ouch! You've just gotten a paper cut on your finger. What's the first thing you do? If you're like most people, you'll probably put your finger in your mouth. If you think about it, you probably have no idea why you put your finger into your mouth. Actually, when a dog licks its wounds or you put your paper cut ravaged finger in your mouth, you are beginning medical treatment.

Ref: "An Aid to Healing that Simply Can't Be Licked." Discover, April, 1986. P. 10. Diagram: Protein structure of mouse epidermal growth factor. (PD)

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