Newspapers report that Wendy, the bully whippet, despite her appearance, luckily retains the loving temperament typical of the whippet breed. Wendy was born from the cross between two muscular and fast, but of normal appearance whippets. 
Some of the progeny inherited the mutant genes from both parents and shows a mutation that magnifies muscle growth.The bulky appearance of Wendy is due to a lack of the protein myostatin that limits the growth of body muscles. The mutation was known and studied before also in cattle, sheep and mice. Compare Wendy's outline with that of a normal whippet.
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