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Spider blood fluoresces

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7:32pm, April 30, 2007

Fluorescence under ultraviolet light seems to be a widespread trait among spiders, say researchers who have done the first broad survey of spiders for this property.

The researchers tested blood from representatives of 10 diverse families and found that while under ultraviolet (UV) illumination, all samples glowed blue to human eyes, says Susan Masta of Portland State University in Oregon. In a wider survey of 19 spider families, at least one species from each fami

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