A microRNA solves an evolutionary mystery of butterfly and moth wing coloration

Over the past two decades, scientists discovered that the majority of melanic wing color variants are controlled by a single genomic region surrounding the protein-coding gene ‘cortex’. It was assumed, then, that cortex was the melanic color switch. A team of international researchers has now discovered that cortex does not affect melanic coloration. Instead, a previously ignored microRNA (miRNA), is the actual color switch.
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