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Which is not a proper resonance structure for 1,3-butadiene?
Skin Graft
A surgical procedure where healthy skin is transplanted to a damaged area of the body.
Blister
A small pocket of body fluid that forms in the upper layers of the skin, usually in response to rubbing, burning, or freezing.
Ecchymosis
A change in skin color due to blood leaking beneath it, usually resulting from a bruise.
Bulla
A large blister or fluid-filled vesicle on the skin, or a rounded cavity or space in bone or other anatomical structures.
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