ArticleScience advances2026
Sensory receptor expansion and neural accommodation in butterfly color vision.
Article in Science advances, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The evolution of complex brains required the incorporation of newly evolved neurons into existing circuits, yet the genetic and developmental mechanisms enabling their integration remain poorly understood. Butterflies expanded their color vision by adding a second R7 photoreceptor per ommatidium, a rare departure from the conserved insect eye ground plan. Because each R7 makes an independent stochastic fate choice, this duplication increased the number of ommatidial types from two to three. We identified the genetic basis of this expansion and demonstrated how the brain accommodates the new input. R7 duplication was achieved by converting R3/4 cells to an R1/6 fate, triggering the R7 recruitment program on both sides of the ommatidium. By manipulating transcription factor expression in
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