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The phenotypes of juvenile (A) and adult (B) surface fish, reciprocal hybrids, and cavefish. Top row: surface fish. Second to top row: surface fish (female) x cavefish (male) hybrid. Second to bottom row: cavefish (female) x surface fish (male) hybrid. Bottom row: cavefish. Scale bars: 100 μm in A and 400 μm in B.
