Deep-sea fish break the mold with novel visual system

WASHINGTON: For more than a century, biology textbooks have stated that vision among vertebrates — people included — is built from two clearly defined cell types: rods for processing dim ​light and cones for bright light and color. New research involving deep-sea fish shows this tidy division is, in reality, not so tidy. Scientists have identified a new type of visual cell in deep-sea fish that blends the shape and form of rods with the molecular machinery and genes of cones.

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