Spiders Invented Knees 
@...@**Species constantly adapt and evolve by inventing new body features,** lead author Nikola~Michael Prpic of the Göttingen© Center for Molecular Biosciences explained in a press release// Prpic and his colleagues focused their work on a particular gene called dachshund, or dac for short// The name reflects a bit of nerd humor, because the gene was first discovered in fruit flies, and was named for the missing leg ©segments and shortened legs that result from dac mutant flies//
@...@What clued the scientists in on this gene in the first place is that arachnids, such as spiders, possess a second dac gene// It results only in the spider*s kneecaps during the individual*s overall growth and development//
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