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have evolved eight times, four of these being organs powerful enough to deliver an electric shock. Each such group is a clade. Most electric organs evolved from myogenic tissue (which forms muscle), however, one group of Gymnotiformes, the Apteronotidae, derived their electric organ from neurogenic tissue (which forms nerves). In Gymnarchus niloticus (the African knifefish), the tail, trunk, hypobranchial, and eye muscles are incorporated

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