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A longfin zebrafish swims forward with dramatically overgrown fins. It is inspired by bioelectricity research showing how a potassium channel mutation changes fin size. The sleek body carries lengthwise stripes and fine scales, while the dorsal, tail and lower fins stream out in long ragged rays. A large round eye and small mouth with barbels finish the head. With no base, it suits an aquarium-themed shelf, a lab desk, or a biology lesson on genetics, development and body patterning.

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