Sensitivity to sunlight, a thirst for blood, and a nearly corpse-like
complexion are the classic signs of a vampire; they're also the signs
of a genetic blood disease known as erythropoietic protoporphyria (EPP),
as a new
study calls
the condition. Although the disease itself is not new, researchers for
the first time have identified the specific genetic mutation they
believe is behind much of vampire lore.
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